From 3.5 billion Reddit comments

1129 points

·
14th Sep 2011

Khan Academy. My friend showed it to me senior year. It's a great video website for learning various elementary to college level topics. The instructor and creator of the videos is just an amazing teacher. http://www.khanacademy.org/

541 points

·
29th Oct 2012

The rules didn't apply for that little cluster. It's better to call it the 'singularity'. Everything we know about physics breaks down in that little point. In fact, the word 'before' can't even be used here, because time didn't exist before the Big Bang. Time, as far as we are concerned, began *at* the Big Bang.

So to answer your question - that singularity became matter and space itself. The Big Bang caused a very fast expansion of space. And today, space is still expanding. Quite fast.

Often, that leads to another common question. What is the universe expanding into?

I want to link to a few videos that explain this quite well from Khan Academy. They're absolutely free and very well explained. A good place to start is here: Big Bang Introduction and work your way across the videos (left column) to a bit of mind-bendiness: A universe smaller than the observable universe.

324 points

·
14th Mar 2011

From what you have writtten above it is quite clear that you are not "retarded". You seem to be quite able to express yourself and, if fact, do so in a clear and concise manner. Don't be so hard on yourself.

Have you been tested for any learning disabilities that may effect your ability to do well in tests? If you have and are all clear then it could just be the case that you need a different teacher. Have you tried looking online for learning opportunities such as with Khan Academy? You may just need to find a teaching style that works for you.

246 points

·
27th Jun 2011

http://www.khanacademy.org/#credit-crisis.

The mother site contains over 2000 short, 2 minute videos on various topics. The Site listed includes 15 or so that explain the underpinings of the financial crisis including mortgage backed securities, credit default swaps, etc., These videos are informative, and the information is easy to digest.

205 points

·
28th Mar 2011

By making it boring via tedious, rote work. By failing to point out the magic. By not making it clear how such things will be useful down the road. Story problems are generally situations no one is ever actually in. I have never had 25 apples and had to distribute them among three friends.

If classes were more integrated and some more practical things were taught sooner—simple programming and engineering and scientific experimentation—which made use of various mathematical techniques recently learned in another class, I think students might actually be more engaged.

Additionally, I'm not sure what exactly it is that makes it different from regular classroom learning, but the videos on the Khan Academy are extremely engaging and can, over just a short series of 10 minute videos, teach concepts that take years to learn in schools.

203 points

·
11th Apr 2011

Higher Education: The next bubble to burst. It simply can't continue on the path it's on now.

I like what the Khan Acadamy is doing. The evolution of this will be the future of the educational system.

We should be teaching our kids to be autodidacts and getting their own education.

179 points

·
12th Sep 2012

Hi I am the creator of this video.(the above links to a stolen clip re-posted on youtube). My full series is posted at (www.youtube.com/user/ArtOfTheProblem). Originally a kickstarter project: http://www.kickstarter.com/projects/artoftheproblem/gambling-with-secrets/ funded with 1 dollar to spare)

This series recently lead to a (dream) job at Khan Academy (I was lucky that Sal saw a clip on YouTube!)

I'm posting videos + interactive explorations & programming adventures using John's amazing CS tool (http://www.khanacademy.org/cs/prime-adventure-level-1/1018672065)

ps. Next week I'm starting a new series on Information Theory!

ppss. All of these are also available on university of reddit

177 points

·
27th Jul 2012

The Khan Academy is helping me change my life! I'm going to shift gears from the social sciences to STEM over the next year, and it's helping me tackle the biggest hurdle for me: mathematics.

169 points

·
7th Dec 2012

Yes - you've already done the first step: recognizing your weakness.

Now, if you truly want it to not be a weakness, attack it.

Take math classes and don't quit. Work with your professors/teachers every day after class if you have to. Get tutors. Use Khan Academy. Try to get into MIT, Caltech or Harvey Mudd. Even if you don't make it, you'll be miles ahead of where you are now.

If you aim for the stars and miss, you'll still hit the moon. How's that for a cheesy apropos?

Also, since you are already good at science, keep working on that. You'll soon find how math and science start intermixing and complementing the other. You may just find your talent with science is a bonus in math!

EDIT: PM me with any specifics you think you want to talk about!

164 points

·
18th Feb 2012

Check out Khan Academy. All of their learning tools are free and you can find practically anything you would like. iPod-U also has some great learning tools, but I seem to remember most of them being at university level.

You may also want to speak with your local librarian about a literacy coach. There are volunteers who will help you with your reading level if that's something you're uncomfortable with. You may also want to check your local university about adult learning courses. They will teach you study skills, and will enroll you at the level (finite, pre-algbra) you're currently at so that you're successful over the course of your academic career.

Learn something that you've always wanted to. It doesn't necessary have to be academic, it can be anything you're curious about. You'll meet people with like interests along the way.

100 points

·
18th Aug 2013

KA engineer here.

Thanks for suggesting us. By the way, we added a completely new interface for learning math two days ago:

http://www.khanacademy.org/about/blog/post/58354379257/introducing-the-learning-dashboard

If anyone here has tried KA in the past, I urge you to try it again -- it's a lot cooler now. :)

75 points

·
27th May 2012

I taught my daughter calculus starting around age 6-7. Actually Salman Khan did most of the work. She's now 10 and knows most of the math that I do and then a bit.

All the rest of you with school age kids, start them on Khan academy! If you don't know the material, learn it yourself. It's not really that hard, and it's shameful how much public schools have dumbed down math education.

72 points

·
14th Aug 2012

I disagree. Coding may be different from computer __science__, but you wouldn't try to start teaching someone physics by throwing them into the deep end of a textbook full of equations and no pictures.

>Rather than starting Computer Science education off by explicitly teaching how a computer works or fundamental programming concepts (like variables, logic, control structures, etc.) you put the student into code of graduated complexity and encourage them to manipulate, explore, and write their own programs.

>__(from Redefining the Introduction to Computer Science via viddy)__

Starting with interactive coding which give immediate visual feedback is one of the best starting points. They have a tutorial on Turing machines and I'm sure that as students progress to that point, there will be more demand for diving deeper into computer __science__ itself.

66 points

·
4th Apr 2012

I used to have this problem...

I spent a lot of time at school / uni / work not being great at maths. I used to understand the concepts of algebra and pre-calc etc at a high level but really couldn't apply it. It just didn't make sense to me.

The turning point came when someone (my wife) pointed out that I seemed to be missing some of the fundamental experience with the basics of maths. Stuff that I felt I should just know. I was actually oddly unable to even admit to myself that i really didn't know some of the stuff that (in my mind at least) was trivial.

The way I solved this was to go right back to the beginning - learning very basic fractional manipulation, really simple algebra from simple linear equations, on to simultaneous equations, to quadratics and pre calc.

This was an eye-opener for me as once I started laying solid foundations to my understanding it was so much easier to build on.

Later in life I went on to study for an undergraduate degree in Maths. Something I'd never have done without someone pointing out to me that you can't build a house without good foundations.

Try this out http://www.khanacademy.org/ There's a Math(s) section and it's very good.

TL;DR: If you're struggling maybe you need to go right back to basics and build up your understanding. It worked for me.

52 points

·
23rd May 2011

Right after submitting my entry i *also* learned that I could've just linked the actual friggin site instead of the wiki article I was reading >.<
Oh well:

**Edit:** wtf, I can't believe that searching for the original Khan academy URL would take me to the University of Reddit which I've linked. That clearly needs to be regurgitated on the front page more often!

47 points

·
11th Apr 2013

So, Apple released an app for creating cool and dynamic digital textbooks. The only flaw? It's not standards based: you need an iPad. If they created a tool that generated HTML content, then any kid in the world using any cheap device could benefit. But they didn't.

So, there's currently two sides in the educational debate. Some folks, like Mr. Khan and MIT think education should be available to everyone. Others, like Apple, think education should be available to those that can afford it.

47 points

·
29th Jun 2012

If you need additional help you might want to check out Khan Academy. It's basically the largest free online school and it's designed to help you all the way from 1 + 1 to advanced calculus, along with lots of other subjects. If you want to learn more about it you can watch a good video about Khan here. Hope this helps!

43 points

·
15th Jun 2011

If you're serious, you might wanna know about Khan Academy. I **sucked ass** as math, but nowadays (and 50+ videos further) I don't suck as much anymore :D

Note: the website ~~needs~~ **requires** a Google or a Facebook account **to log in to.**

edit 3: You'll need to log in when you want to practice! It is acutally **not** *required* when you want to watch videos!

41 points

·
27th Nov 2011

Khan Academy is wonderful. Start from the basics, though, even if you think you're good. Mathematics builds upon itself, and without a proper foundation you can't really progress.

39 points

·
16th Feb 2012

And this is why the Kahn Academy model is so sorely needed to educate the future.

I hated school because I was bored, and also one of the reasons why I did not do well. The main one being I was lazy.

35 points

·
3rd Feb 2012

Look up the Khan Academy. Its a free online college level education with hundreds of videos on many subjects. There are 63 biology videos, each is about 20-30 minutes and explained very well. I homeschool but everyone in my family is an atheist. I take many Khan academy courses as a part of my education and I recommend you do to.

Heres a link http://www.khanacademy.org/

34 points

·
15th Jun 2012

I have no specific useful tips (nor do I claim to be particularly good at math, only interested), but something that really helped me was Khan Academy. All the lectures are in video with pertaining exercises. He is really good at explaining and giving examples so it is easy to understand. If you're having trouble with multiplication and division, maybe the arithmetic-section is something for you to start with?

33 points

·
12th Aug 2011

I know you're kidding but maybe we could all use a little bit more of the r/universityofreddit and Khan Academy-ies of the world and a little less of r/pics

32 points

·
22nd Jul 2013

Assuming you're taking a generic college-level Calc I class, you will need to learn two types of Calculus. This may seem like a lot of work, but really it's just a way of defining different areas of study.

*Differential Calculus:*

http://www.khanacademy.org/math/calculus/differential-calculus

This site does a great job of explaining differential calc from the ground up. Since you've already had Trigonometry, I'm assuming you've had some exposure to Algebra and graphing basic equations. With that said, make sure to pay special attention to the types of rules and how they are used (Eg. Power Rule, Chain Rule, etc...) This will save you a lot of time because you won't have to constantly check back on how to do it. It's nice to be able to say, "Hmm, the derivative of x^2? Oh yeah, the chain rule! It's 2x."

Also, take some time to familiarize yourself with the various types of notation. Personally I find Lagrange's notation to be the simplest, and more often than not it is what will be used.

http://en.m.wikipedia.org/wiki/Notation_for_differentiation

*Integral Calculus:*

http://www.khanacademy.org/math/calculus/integral-calculus

Once again, the same site explains the concepts and practice of Integral Calculus such that a 5-year-old could make some sense of it. Get the rules down pat and you'll be golden.

I wish you the best of luck in your studies. I won't lie to you, Calculus is an entirely new concept and can take a bit to grasp. However, the real-world applications are "limit" less :D

32 points

·
25th Aug 2012

I'm sure this is gonna get posted 1000 times but here are some useful links to catch up.

http://www.khanacademy.org (Math/Science)

http://www.coursera.org (Focus on computing math, but many various courses)

http://www.duolingo.com (Foreign language)

32 points

·
11th Mar 2012

> I genuinely wish I understood more about the bailout, though. It was one hell of an economic event.

31 points

·
28th Feb 2013

I think Khan Academy does an excellent job "within" the current model, and in their many test runs of reversing the school system when the kids study at home (with their online classes) and come to school to do the homework with a teacher and the other kids (who help each other learn actively) have produced great results

If you haven't seen Khan's ted talk this is a must: http://www.youtube.com/watch?v=gM95HHI4gLk

29 points

·
26th Jul 2012

I haven't watched any of the Khan videos before, so I decided to pick one at random and record my thoughts. I picked the video on inverse sine

http://www.khanacademy.org/math/trigonometry/v/inverse-trig-functions--arcsin

It starts off pretty well, though I would have chosen an angle other than pi/4 since it has the same sine and cosine. It would have been harder to derive the sin of (say) pi/6, but that should be something all students would be able to do by the time they got to learning about inverse trig functions.

When he starts talking about the domain of arcsin, he doesn't explain why the domain is what it is. Why not 0 to pi? Why not 0 to 2pi? These are natural questions students ask when learning this concept.

In general the video seems unpolished and stream-of-consciousness, which is fine, but you can tell that he isn't an experienced math teacher. His refusal to use parentheses is aggravating to see, especially when he writes stuff like sin^-1 -sqrt(3)/2. There are several ways students will commonly misunderstand that collection of symbols, and he breezes right over it.

My conclusion is that this video would be a useful *resource* for a student learning this material, but not really a replacement for a well-trained math teacher/professor. Granted, many students have a teacher/professor who is *not* well-trained, in which case these videos may be the best resource they have available.

I wonder if Khan has considered hiring a professional mathematician/physicist/etc. to improve his videos? Given the popularity of the videos, I would think he'd be able to afford it.

28 points

·
7th Apr 2012

Khan Academy may not exactly be deemed all interactive but it has a huge amount of videos available and quite a number of interactive mathematics practice, so it is well worth your time if you want to learn science and maths stuff.

28 points

·
19th May 2011

MIT has free online courses for CS, Khan Academy has many helpful Math and Logic lessons, all of which are free, and here are a ton of free online CS textbooks.

Did I mention all of those are free? You no longer have any excuses. God speed, my friend.

27 points

·
16th Feb 2011

you may find help here in this massive amount of free instructional video published at Khan Academy

>Topics covered in the first two or three semesters of college calculus. Everything from limits to derivatives to integrals to vector calculus. Should understand the topics in the pre-calculus playlist first (the limit videos are in both playlists)

26 points

·
21st Aug 2013

As my reply on the website is pending your review, here's a copy for redditors -- so they will not get too excited without a good reason:

Your post suggests the differences in averages reflect some real differences in the compensation of programmers. Yes, the numeric values obtained in your analysis are not exactly the same. The question is rather: Are they really different?

To illustrate this: assume person A and B are each tossing the same 3 dice, obtaining [1,3,4], and [2,4,5] as results. Averages are 8/3 and 11/3 respectively — yes, they do differ. But did the dice change in the meantime?? Or will person A consistently get a lower average than person B? Yet this is exactly the kind of conclusion your post appears to suggest…

There’s an established method to do this check — see http://www.khanacademy.org/math/probability/statistics-inferential/hypothesis-testing-two-samples/v/hypothesis-test-for-difference-of-means for an example. Any statistics package nowadays supports this test.

26 points

·
18th Feb 2012

Get a few garbage bags and throw out everything you don't need in that computer room. Make it look tidy, at least briefly, like it was being shown to sell.

Get out of the house. Walking is a form of exercise. You can lose weight that way. Don't put crap in your body - especially when weight loss is a major goal.

Figure out what is at khanacademy.org. Make your self spend 1 hour a day there. Set up an account and start at the beginning.

You can learn useful overviews of topics and history over at wikipedia. Focus on school topics. Get some knowledge in your head.

Schedule your time. By 9am, eat breakfast, shower, get dressed and do something for exercise. Late morning, early afternoon, learning. Don't waste your time; actually learn something. Finally, after supper - you're done. It's you time. If you didn't get enough done, work harder tomorrow at getting it done during the day. Don't spread the misery out.

Eventually you want to get yourself into an adult education class. Lots of people do this. This up coming week find out where you will eventually go to do this in your city.

Once you're in a better place, get a part time job. So what if it pays minimum wage.

Remember: You want to be a more reasonable weight (diet + exercise) and more educated (useful time on specific websites + adult education). The mess you're in didn't happen over night and will take time to turn around. Don't dwell on the past -- work on getting to a better place.

I don't who you're living with, but consider letting them in on your plan. Let them know that you're working towards improving yourself.

Recap: Clean up your office and bedroom well. Stop drinking sugary coke. Stop eating poorly. Walk; exercise. Focus of learning. Don't sabotage your life.

24 points

·
10th Jun 2012

I'm listening right now. He's trying to make a case for astrology.

I love the podcast, but Joe really needs to start becoming better educated. There's no excuse these days for someone who claims to be interested in how the world works to remain ignorant of the actual reasons.

The moon doesn't have any effect on behavior, if that were the case we'd be able to run an experiment to show that to be the case.

Joe, or anyone associated with the podcast that might see this, please spend an hour or 2 a week at Khan Academy.

Most of the things that fascinate have actual, testable answers that are far more fascinating than the boring, false answers given by charlatan astrologers.

Also, soon EdX will be running full scale.

22 points

·
21st Apr 2012

I'm truly sorry. You have been cheated of your right to an education by scoundrels.

Check this out: http://evolution.berkeley.edu/

This should be useful also: http://www.khanacademy.org/science/biology/v/introduction-to-evolution-and-natural-selection

22 points

·
9th Oct 2011

21 points

·
27th Aug 2013

Khan Academy has videos for every topic covered in organic chemistry 1 and 2 and the guy in the videos made it super easy to understand.

The videos are time consuming and there's about 35 hours of material on his site, so I suggest watching it as you go through the course to make your load easier, but it's explained very thoroughly and I highly recommend it to anyone struggling with organic chemistry.

I used to suck at it, but I spent my spring break in college doing nothing but watching these videos (which are broken down by topic, I forgot to mention that) and I went into my midterm for OChem II and absolutely killed it, ended up getting an A-

Trust me when I tell you, there is no better resource for studying and learning OCHEM than this!

21 points

·
17th Apr 2013

There is an excellent lecture on Kahn academy about this, watch both parts. My brother was considering buying a house because it would be 'just as much as renting' if he were to move to Iowa with his girlfriend. I think it's good to consider all possible costs.

http://www.khanacademy.org/science/core-finance/housing/renting-v-buying/v/renting-vs--buying-a-home

Edit: forgot to say my brother no longer wants to buy after I sent him this.

21 points

·
13th Jun 2012

First, you are awesome.

The hardest thing is going to be the math. You must know it cold. Any gaps will slow you down until you just can't keep up any more. Try http://www.khanacademy.org/ to see if that format works for you. Otherwise, may be try and find out your school's textbook and work through it before taking the class.

For fun, try tutoring underprivileged high school kids in math and science. It's incredibly rewarding, and teaching is the best way to learn a subject inside out.

20 points

·
7th Oct 2012

The math behind all forms of gambling is rooted in the concept of expected value. Every form of gambling offered by a casino is designed in such a way that although any one independent wager may allow a win for the player, over an infinite series of wagers the house will make money. Poker is really the only form of gambling spread in a casino that you can win money at longterm because you aren't placing wagers against the house; They make money off of taking a small percentage of each pot, not off of rigging the longterm odds against the player. In poker you're playing against other players who are often playing imperfectly, so if you make good enough decisions over a long enough period of time your play will have a positive profit expectation.

www.wizardofodds.com is also a good resource if you're interested in more info.

20 points

·
1st Mar 2012

I could never have gotten through it by myself. I recommend to seek out groups to study with, going to office hours (write down questions during class on everything you don't understand if it's a large class and you can't ask during), people who have taken the class before / tutors, and check out websites like these:

http://www.khanacademy.org/

http://patrickjmt.com/

http://www.allaboutcircuits.com/

Depending on the area of ECE you go into, it can become less math and physics oriented. Depending on courseload, I would recommend not working part time, but don't study constantly. Take breaks and have fun: your mind will work towards figuring things out even while you're not actively studying.

ECE isn't for everyone, but if it's your passion, don't give up yet.

20 points

·
29th Mar 2011

Khan Academy explanation of Compound Interest:

http://www.khanacademy.org/video/introduction-to-compound-interest?playlist=Finance

http://www.khanacademy.org/video/the-rule-of-72-for-compound-interest?playlist=Finance

19 points

·
23rd Aug 2013

You are asking two separate questions. The first question is the gambler's fallacy. If you rolled a coin on heads 19 times in a row, that does not affect the chances to roll tails in the 20th roll, you still have a 50% chance to roll tails on the 20th roll, as that roll is not affected by the rolls that came before it.

http://en.wikipedia.org/wiki/Gambler's_fallacy

So if you had a 5% chance for an outcome, and if after 19 rolls you have a negative outcome, the chance that you get a positive outcome on the 20th roll is still 5% because the events are independent.

For your second question, given 20 events with a probability of positive outcome at 5% for each event, the probability that you have a positive outcome at least once in the 20 rolls is most certainly higher than if you only roll once.

See this for more info:

19 points

·
20th Aug 2012

I'm curious as to why I would want to go to RedditU rather than better, proven offerings like Khan Academy or even wait for MIT&Harvard to fully spool up EDx or even the iTunes U course materials that are available?

Why not even partner with these institutions? Why would I want to learn from some schmuck on Reddit instead of going to these other places?

19 points

·
16th Mar 2012

Here's a great resource for secular homeschoolers:

Right now it's still math-oriented in its exercises (that's not a bad thing but I'd like more), but there are a lot of videos on a lot of subjects that are good watching.

19 points

·
26th Jun 2011

Don't worry, it's a pretty simple concept. Basically, the adenosine group is linked to three phosphate groups in a chain, an arrangement that causes the third phosphate group to exist in a high energy state. Thus, the detachment of the third phosphate group results in a release of energy that can then be harnessed for other processes. You end up with ADP (adenosine diphosphate, intuitively) and a 'free-floating' phosphate group, which can be united again to transport more energy (the basic idea behind the cellular respiration and light-dependent reactions of photosynthesis). At least, that's my understanding. I'm not a biologist, just a high school student with a strong interest in the subject.

This video from Khan Academy explains it really well.

18 points

·
17th Jan 2014

You cannot learn too much math. I recommend Khan Academy.

After you get the basics of programming you will want to learn some design patterns. It will help you tons on how to read code as well as how to construct code. Design Patterns: Elements of Reusable Object-Oriented Software (text book style) or Head First Design Patterns (much easier to read)

Other than that, the very best thing you can do is read other peoples code and write lots of code.

18 points

·
10th Dec 2012

Japan exports a lot of stuff. The more you export the more another country has to convert their currency to buy your stuff, which creates a demand for your currency. These videos go into the details http://www.khanacademy.org/finance-economics/currency

18 points

·
23rd Apr 2012

There are many like you, and always, the Khan Academy is brought up. If you haven't checked it out, I would start there.

If you insist on getting a book, I really have no idea what to recommend you. Sorry.

18 points

·
11th Oct 2011

Not to discourage other redditors from putting a class together on this, but have you considered using Khan Academy? Sal's an excellent instructor and you're able to practice your newfound skills in various problem sets. There's even achievements!

17 points

·
20th Feb 2013

That's not a problem, I've been teaching genetics for quite some time. Triplets of DNA/RNA nucleotides code for specific amino acids, GAC codes for Aspartic acid, which has the single-letter abbreviation D.

D: Aspartic acid, GAC A: Alanine, GCC R: Arginine, AGA W: Tryptophan, TGG I: Isoleucine, ATC N: Asparagine,AAC

Khan academy has a nice video on it here.

17 points

·
19th Aug 2012

http://www.khanacademy.org/ I use that, and I get out there and read real books. Reddit has helped my view a lot as well, because in my environment I wasn't getting any kind of good literature or science advice.

17 points

·
29th Apr 2012

Oxford History of the French Revolution by William Doyle

Khan Academy has a bunch of great video lectures about the French Revolution and Napoleon

17 points

·
20th Apr 2012

Thanks. I love stuff like this and these guys do a lot of kinesiology and exercise science-which is good! If anyone want more free education, particularly in math and science, check out Khan Academy. Also, hook me up with any other websites you may find that are similar.

17 points

·
29th Mar 2012

Lots of truth in that - I sucked at maths in high school whereas I'm a straight high distinction student now. (Those are A's for you Americans).

At the start of last year one of my lecturers said maths is easy - and somehow it just sunk in that it is.

I think in many ways the reason that I struggled in high school was not being taught the whole of a method, or at least enough that you can understand its properties.

Maths is a subject you can get great grades in just through practice. It now seems easier to me than writing creatively for instance.

So in essence, just keep at it. If you are struggling watch some lectures on youtube or through khan academy.

17 points

·
16th Nov 2011

I'd just like to point out this phenomenon isn't US specific. It happens here in Finland even though we're said to have some of the best (mathematics) teachers in the world. (This is according to PISA studies.)

What I've learned to do is look up all the things I'm expected to learn at Khan Academy. They don't have anything on local diffeomorphisms, but everything up to that point I've found a clear explanation to!

17 points

·
10th Nov 2011

Good for you! I hope that the love keeps flowing, but there are times when things mighty get sticky. When that happens, don't forget all the places you can go for help like r/cheatatmathhomework, The Kahn Academy, Ask Dr. Math, your campus tutoring center, etc.

17 points

·
27th Jan 2011

If you want to improve your intelligence, you can use websites like MIT open courseware and http://www.khanacademy.org/ to improve anything you wish, if you are willing to watch the lessons and do examples.

16 points

·
18th Jul 2012

Two very good sources for someone looking to learn. As an aside, I wouldn't worry about the fact that you found it difficult to follow Inside Job; derivatives such as CDOs and CDSs are complex even to experienced investors.

16 points

·
28th Jan 2012

I'm going to use a sports analogy (this is ELI5 after all)

Red Team (Republicans) and Blue Team (Democrats) choose who they want their captain to be with primaries and caucuses. In primaries and caucuses, the team mates vote. In a closed primary, you can only vote for team mates to be the captain of their team. In an open primary, you can vote for the other team's captains. A caucus is a little more complex (watch the aforelinked video).

After each state votes, they win delegates, which are people who pledge to vote for a candidate. The delegates then go to each team's meeting (Republicans: RNC, Democrats: DNC) and put in their vote, representing the rest of the team's wishes. Depending on how that vote goes (we usually know the result before they actually go to their meetings to vote), the person that they ultimately choose to lead their team is put on the ballot so that anyone (on the Blue Team, Red Team, or other smaller teams) can vote for him to win.

OP's question is like asking, "What if Blue Team people go on Red Team so that they can vote for a bad captain that would make it easier for Blue Team to win?"

16 points

·
28th Dec 2011

He prefers to keep his religion a private matter, and on the website it says:

**"If you believe in trying to make the best of the finite number of years we have on this planet (while not making it any worse for anyone else), think that pride and self-righteousness are the cause of most conflict and negativity, and are humbled by the vastness and mystery of the Universe, then I'm the same religion as you. "**

What we can safely say is that there's a decent chance he has been influenced by Islam(as many of his relatives are Muslim. That said, it's relevant to note that historically Muslims connected the ancient Greek un-translated works with Renaissance Europe, so we don't think that somehow being religious is being anti-science.... ).

16 points

·
2nd Aug 2011

I strongly recommend reading Darwin's On the Origin of Species. I know it doesn't sound original, but there's a reason it made a stir! Clear, simple thinking. You can memorize a lot of facts, but to understand the underlying forces and reasons that explain why those facts align in the way they do - you'll need to understand evolution. And it's not really that complex.

Also, Khan Academy.

^-- I cannot recommend this strongly enough. Free videos that go through pretty much everything you'll need to know in a first-year biology course at college.

And just for fun: the video that jumpstarted my love for molecular biology. Watch this, and don't worry that you don't understand most of what you're watching. It's all of the little molecular biological interactions that made the original scene possible: movement of a white blood cell through the veins, eventually slipping between two cells in the wall. Beauty. Pattern. As you learn later, you'll enjoy coming back and watching and saying, "Aha! I know what happened there!" Have fun with your studies kelsbar. Welcome to the world of biology.

16 points

·
13th May 2011

Watch this and the following videos: http://www.khanacademy.org/v/currency-exchange-introduction?p=Currency

It takes him a few videos to start explaining the China situation, but you need the background to understand what's going on.

15 points

·
24th Oct 2012

Trust me, you have one of the better professors out there so don't take that for granted. And as eBreaks said, definitely definitely go to the Calc lab, these TAs are there to help with the 20 series and that definitely saved my butt on countless occasions.

Talk to your professor/TAs and see what you can do to help your grade, Eggers is a great guy that cares about his students. The class is probably like 200 students, and I bet only 5-10 students actually talk to him.

Also have you considered OASIS? (I know sign ups are probably over, but consider it for your next class, it's just more tutoring, in a more intimate setting.

Finally, if all else fails, go to http://www.khanacademy.org/math/calculus, that site has definitely taught me more in any subject than UCSD professors.

And math is really a repetition subject, things are hard at first but that's why there's so much homework. You'll eventually get the hang of things. And if you're trying as hard as you say you're trying, you're definitely going to do better than 90% of your classmates in the long run.

15 points

·
19th Sep 2012

You need to distance yourself from the negativity as quickly as possible. Cut ties, leave them to fend for themselves. You're obviously hardworking and most likely smart, but just stuck in an awful situation.

Its hard to comment on what you should to do since you must have a very different standard of living. But try to get out as fast as you can. Just leave a note and never look back.

If you can provide more details of where you live/what you're willing to do (leave your home, move cities/countries, etc), it may be easier for people to give you advice.

Evoultionisafact linked this: http://www.khanacademy.org

Try it out, even if you continue working the bad job for another year or two, you may be able to learn some fantastic skills in the mean time!

15 points

·
28th Aug 2012

I can't recommend the Khan Academy enough, when you've forgotten something in a math class you took previously, Sal does a great job of explaining it again and bringing you back up to speed.

15 points

·
9th Apr 2012

If you are studying for the GED and need help with the math portion, try using Khan Academy, if you don't already.

Sorry for the unsolicited advice. Hope you aren't offended. Good luck!

15 points

·
23rd Feb 2012

Khan Academy is without a doubt the website you want to use.

It goes thru alot of maths and even economic ideas, that will definitely help you start. you can even login in and track which videos you have reviewed and track your progress

15 points

·
16th Sep 2011

I'd start with these: Khan Academy - Biology and work your way into the Chemistry and Organic Chemistry sections.

15 points

·
8th Sep 2011

I'll post them here for accessibility/historical.

Every item on the list is a direct link to Khan.

Side note-- It's worthwhile to mention Khan also has a large focus on python lessons

**Prerequisites**

Some of the topics in Introduction to Artificial Intelligence will build on probability theory and linear algebra. To brush up, here are some related videos from Khan Academy. Watching these videos is not required, and you can probably do well in the class even if you are not initially familiar with these topics but are willing to work hard.

- Basic Probability
- Probability (Part 6) [Conditional Probability]
- Probability (Part 7) [Bayes' Rule]
- Probability (Part 8) [More Bayes' Rule]
- Introduction to Random Variables
- Probability Density Functions
- Expected Value: E(X)

- Introduction to Matrices
- Matrix Multiplication (Part 1)
- Matrix Multiplication (Part 2)
- Inverse Matrix (Part 1)
- Inverting Matrices (Part 2)
- Inverting Matrices (Part 3)
- Matrices to Solve a System of Equations
- Singular Matrices
- Introduction to Vectors
- Vector Dot Product and Vector Length
- Defining the Angle Between Vectors
- Cross Product Introduction
- Matrix Vector Products
- Linear Transformations as Matrix Vector Products
- Linear Transformation Examples: Scaling and Reflections
- Linear Transformation Examples: Rotations in R2
- Introduction to Projections
- Exploring the Solution Set of Ax = b
- Transpose of a Matrix
- 3x3 Determinant
- Introduction to Eigenvalues and Eigenvectors

15 points

·
27th Jun 2011

The community college stuff is a great idea. I'll just add that, while waiting to do that, you may want to buff up on some remedial stuff (chem, bio, algebra, trig, maybe calc, etc.) with the Khan Academy.

14 points

·
17th Dec 2012

Former 11B here - trust me when I say that I know exactly how you are feeling. It was frustrating enough to me that I had a running joke with a friend that I was going to start answering math problems with the number/type of rounds necessary to "solve" the problem. Trust me when I say that it will make sense again if you give it time.

I can't offer any specific recommendations without knowing what kind of degree you are looking to pursue, but you might consider checking out the Khan Academy or University of Reddit as good places to get exposure to some of the concepts. They both have an interesting mix of modules that you can go through if you have the time, and Khan Academy helped me get through several of my freshmen level pre-reqs. They aren't the same as actually sitting in class, but they might help get your brain ready.

Edited to add: I'm not sure what type of school you're planning on attending, but one of the most helpful things for me was that I started off doing my pre-req's at a local community college before transferring to a larger school. This allowed me to start low (well below what High School graduates started with) and build my way up to harder classes in a low stress environment.

14 points

·
21st Mar 2012

I'm going to side track this discussion in a positive way i hope! With things like http://www.khanacademy.org/ , people can be in charge of educating themselves. MIT is offering free online courses, and it's really the cheapest way of educating the masses.

14 points

·
5th Mar 2012

He's on point about making sure you educate yourself on all aspects of a business, but if you don't want the hassle of an entire degree program just take some classes you think would be useful to you (business, math, basic accounting). There's also many great books and online resources if all you need to do is learn the material (Khan Academy, MIT Open Courseware)

Also, try and learn what you can from your boss (if you like the way he/she does things) or find another contractor you respect and learn from him/her. Mentors are a valuable resource. People have become contractors in the past and done it successfully with less information resources than you have now, you can do it! Best of luck.

13 points

·
18th Nov 2013

here's a basic text primer on marginal analysis/opportunity cost. http://economics.about.com/od/informationforbeginners/a/marginal_analysis.htm

basic Article about a VERY common misconception about debt: http://www.nytimes.com/2012/01/02/opinion/krugman-nobody-understands-debt.html?_r=0

As someone else mentioned, kahn academy is a good site to poke around on: http://www.khanacademy.org/economics-finance-domain/microeconomics/choices-opp-cost-tutorial/marginal-utility-tutorial/v/marginal-utility

I also recommend articles on AlterNet's Economy section, neweconomicperspectives.org, and other sources of non-mainstream economics new and information. Because most mainstream economic "wisdom" is based on elegant mathematical models made to abstractify the real world which frequently requires the data to conform to the theories, instead of the other way around. it's often utterly flimsy with the slightest bit of practical inspection.

13 points

·
25th Sep 2012

Those are all quadratic equations. I'd look them up at Khan Academy: http://www.khanacademy.org/math/algebra

There are several ways of solving them, but if you're not already quite familiar with them, attempting to teach them in a post here won't work too well.

See the videos on solving them by factoring, by using the quadratic formula, and completing the square.

13 points

·
17th Jul 2012

This really isn't a pure logic problem. Logic problems are real-life encodings for mathematical systems.

In this problem, you can check once - you can only "ask" the system one question about your input - and the system described can only tell you one light/switch pair.

Now if you take into account the heating of the lightbulb (which is fine in real life scenarios) the mathematical purity is gone. Why can't I set up a camera system in my trip upstairs?

That's why, in my opinion, this problem is lackluster. Something like the blue forehead problem (see Khan Academy video) can be proven mathematically by induction. The blue forehead room problem is a true logic problem.

13 points

·
24th Jun 2012

Ahh! I was once you!

Okay, here's the thing, math math math! Math at least two hours a day when you're not in school, I'm not kidding, and I don't wish I were. I have this buddy, Khan, who'll teach you the main concepts of calculus, linear algebra and differentials. You can even practice some calculus problems, iffin you need!

Does your high school have a Science Olympiad team or sommat of the like? I'd hit that up! Honestly, it's worth it. Really good times and you learn so much.

Oh, and you can read and stuff, as well. You can read The Elegant Universe, The Trouble with Physics, look at QED by Feynman, etc.

So, math and physics! Keep practicing! Don't neglect other cool subjects such as chemistry and biology and philosophy and stuff, however. These are all important, too, I think! One thing I hate more than anything else is a peer who scoffs at the idea of like microbiology or something.

Oh, and learn to program. You'll have to learn it eventually if you're going into astrophysics, and you better start learning how to properly code now. I hate looking through some of the crap grad students often spew out. :| Here is something that can help you get started with that.

Oh, and as an undergrad, go to a grad student or a faculty member, ask what kind of research they're doing and get all involved and stuff. Getting into grad school isn't just about grades and things, it's also about who you know and what sort image you've established for yourself.

*Or something.*

13 points

·
19th Jun 2012

Calculus is the obvious one, as integration and differentiation are used in a lot of other classes.

Linear Algebra and basic matrix operations. Pretty much every field in mathematics uses this as a base.

Most universities have a course on basic set theory and proof structures. It sets you up for the kind of thinking that is considered "real math".

Analysis would be the next step, the theorems are simple and intuitive but learning to prove them will develop your skills greatly.

Also, obligatory link to Khan Academy

13 points

·
3rd Dec 2011

I've already seen the answers posted but I wanted to post these Khan Academy videos that I found helpful when learning about this topic.

This is about calculating stellar distance using parallax.

And this one explains red and blue shifts.

I could write a long block comment but I feel Sal at Khan Academy does a better job of explaining than I can, also you might find some other cool cosmology/astrology videos you want to watch.

13 points

·
9th Oct 2011

Have you ever heard of Khan Academy? I watched a video about a class room were the children spent all in-class time doing homework with the teacher, and their *homework* was watching videos from the site of their choosing.

13 points

·
21st Jun 2011

and I don't care what #'s your professor assigns. Do all the problems for a given chapter, unless its like completely irrelevant shit ( to the course ). Understanding electron movement is worth 10x more then memorizing mechanisms.

Practice drawing hexagons in all your other classes.

13 points

·
20th Jun 2011

I don't know if you're aware of the Khan Academy, but Khan's videos are an immense help when you're puzzling out new math topics. I highly recommend watching some of his vids.

12 points

·
19th Mar 2013

I'm not sure you understand economics. At all.

Here you can learn about microeconomics and macroeconomics.

Have fun.

12 points

·
4th Dec 2012

This is very dependent on the location and the extra fees pushed onto you by local and national government. It reminds me of this talk on khanacademy.

I take a little issue with this particular article though - he's making false comparisons. For example:

> I realize that the notion of homeownership as a magical path to wealth is a marketing ploy of the real estate industry. In fact, home prices (like gold prices) generally barely keep pace with inflation.

The comparison is supposed to be owning a house as a liability vs. renting as a liability. Your home price is fixed when you buy it, so inflation is irrelevant except for the short term effect it has on mortgage interest rates (which are offset by fixed rates anyway). Rent on the other hand, will generally increase with inflation. The price of your home only really matters if you're selling it to buy another (in which case you'd expect the rest of the market to follow the same pattern), or if you're in negative equity. Otherwise, you might as well be talking about how the resale value of the house you're renting isn't increasing with inflation.

12 points

·
3rd Dec 2012

I often use KhanAcademy to review a lot of my subjects; there are some useful videos on Newton's Laws, motion and other information that may help you :)

12 points

·
23rd Jul 2012

These might be quite old/known/similar to others posted here, but Khan Academy has some great Brain teasers that are nicely explained. I enjoyed them a lot, hope you will too :) http://www.khanacademy.org/math/brain-teasers?k

12 points

·
14th May 2012

Khan Academy explains this very well in a Currency Exchange lesson, available here.

Now, this video is if you want to learn about currency trading **but** it also shows you how the values of currencies change very well.

12 points

·
3rd Apr 2012

If your goal is to get into machine learning, linear algebra is going to be your best friend. There are structures like vectors and matrices that are elemental to the understanding of large scale data and data manipulation. Check out the Khan Academy to get grounded in the basics.

In general the more math and stats literate you become, the better off you'll be. MIT, Yale, Stanford and several other schools offer their courses online for free. I think Khan is the place to start because that was designed to be used by people on the internet who are learning the basics (i.e. you).

After that you will need to bone up on your programming skills. I like Python and R, both are free and have plenty of resources to help those who are new to the field. The Stanford online course in machine learning uses Octive, which is a development language for machine learning, but I don't know that much about it.

tl:dr Attend to your math first, then learning to program. You'll need a semesters worth of linear algebra (minimum).

12 points

·
17th Mar 2012

Khan Academy is great IMO and has a cool exercise dashboard here which is a visual map of topics starting from basic addition all the way to some calculus. I'd suggest starting with the Addition 1 exercises. They go very quickly at first and it will help you brush up on the basic skills.

Here's a similar thread posted here about a week ago with more comments and some of the same info I've given you above.

Check out some of the other math subreddits linked to on the sidebar here too like r/learnmath.

I'm in the boat as you except I have done some calculus and calculus-based physics before. Good luck!

12 points

·
7th Feb 2012

I would love to help but there is no way to do what you are asking, Options are not simple and take time and effort to learn and truly understand.

Have you watched the Khan Academy videos? I think they are pretty clear in their explanation.

Another place to get good information is the CBOE. Here is their basic option tutorial.

If you still don't get it, maybe try asking a more specific question.

12 points

·
30th Jul 2011

Google says that was actually a serious answer? The internet is weird.

Also, for the lazy, or those who, like me, hadn't seen that one before - http://www.khanacademy.org/ (but feel free to let lnxaddct have the upvotes.)

12 points

·
19th Apr 2011

Learning. It does cost money indirectly, but if you're reading this, you already have all the tools you need to learn a whole lot of things. A new language, how to program, mathematics, physics, chemistry... if you know where to look, you can find excellent quality material intended or suitable for self-instruction on just about any topic.

11 points

·
22nd May 2013

> My intelligence does not extend to math or science, therefore I was royally fucked.

I think the people who think like this were fucked by a bad educational system. Do you know what math *is*? The ability to think abstractly. It's a language, just one that's been stripped of most of the things that make languages like English so hard to learn. **The most likely reason you think you're bad at math is because most math education before the college level is totally incompetent.**

Watch some Khan Academy videos. See if better lecturers can help you understand the ideas.

11 points

·
7th Sep 2012

>You have a large group of people who are able to pay zero dollars every month towards their children's education.

Wait a second, why can they pay zero dollars? Are they unproductive members of society? Or are they unskilled workers that have been priced out of the job market by minimum wage laws?

There's no reason to believe that free markets wouldn't supply something that people demand at a price they can afford. There are already free education services online like Khan Academy, Coursera and others.

There could be schools that cover costs from advertisements. Students could take loans. Students could earn scholarships from organizations.

Or, institutions like the Christian Brothers set up actually *tuition free* schools for people in low income areas, using the profits from their tuition based schools (which are also competitively priced).

11 points

·
30th Aug 2012

Have you had a look at the [khan academy](www.khanacademy.org)? I get my students to go there if they are missing some basic math skills that they need for my Physics class and they generally find it pretty helpful. For instance I just searched there for 'Gauss elimination' and found this video which gives a pretty good example for using Gauss-Jordan elimination to find the inverse of a 3x3 matrix.

You just need to practice your math until you become fluent at it. You should be able to look at a problem and, once you figure out what math you need to solve it, the actual calculations are elementary, like second nature. It's just like learning any other language, or a new sport; you're going to suck at it and struggle at first, but by doing lots and lots of practice of the basics, and then building up to the more difficult elements you will have success.

Don't let yourself worry about what others in your class think of you or your maths ability; you're in college now not high school, no one gives a fuck about what you're doing after the first few weeks.

11 points

·
4th Aug 2012

http://www.khanacademy.org/science/computer-science/

Here's a LPT: don't just watch video's and expect you're learning. You need a project. Pick something you want to make, and make it. Pick small things to start with, so you don't get demotivated when you're stuck.

You are going to get stuck at some point, that's when you need to use google. There's ALWAYS someone that has come across the same problem you're trying to fix.

Good luck!

11 points

·
16th Jul 2012

The share is a unit ownership in the equity of a company. The assets and hence equity increase in value over time for an efficient enterprise. Any acquisition of the company or subsequent public offering takes into account the current market value of the share price. Sal Khan covers it better than I can:

http://www.khanacademy.org/finance-economics/core-finance/v/what-it-means-to-buy-a-company-s-stock

11 points

·
29th Jun 2012

I would like to recommend the Khan Academy sections on probability and linear algebra. (Not all of them, of course. Dip in and out when you need to.) It doesn't cost anything and the videos are probably of good-enough quality for your needs.

Good luck!

11 points

·
21st Jun 2012

You get cancer *because* of telemorase.

Telomeres are like shoe-lace caps, they protect chromosomes from being 'frayed' and becoming useless. Telemorase creates telemores and attaches them to chromosomes during mitosis/meiosis. Telemorase is limited though, and with good purpose. If it was unlimited than cells would continue to reproduce, which is what cancer cells happen to do.

EDIT: For more clarification, our cells are timed to run out of telemorase because continuing to produce say, kidney cells, at an absurd rate would be a waste of energy. Damaged cells don't know when to stop so they keep reproducing, resulting in tumors on the affected area.

EDIT 2: For further further clarification, here's my main man Sal Khan talking about it. http://www.khanacademy.org/science/biology/v/cancer