This app was mentioned in 6 comments, with an average of 2.00 upvotes
5" Floppy disks to Micro SD cards. Corded rotary phones to smart phones. A CRT television with local broadcast channels only to Netflix on my flat-screen plasma television. A small brick house of a PC running the simplest of programs (Apple IIe) to a Gaming PC capable of running the moon landing as a background program while running a game with graphics so great that the Apple IIe would have burst into flames upon witnessing.
Oh, and the thing that makes me happiest, as someone who's not great with maths overall, is the teachers that swore to me that I needed to learn the basics, "because what are you going to do, carry a calculator with you everywhere?"
Yeah. Yeah I am. A calculator, a decent digital camera capable of not only high-res stills, but decent video as well, a phone, a GPS, and the ability to access the entire depth of human knowledge with a few finger presses.
I also built an app to help you keep track of your expenses if anyone is interested.