The Raspberry Pi debuted about 2 years ago, the culmination of a 6-year dream to make a PC tiny enough and cheap enough to restore some of the "hobby hacking" culture of a generation ago. My generation grew up tinkering with DOS-based PCs, Apple II Macs, Commodore 64s, Amigas, and the like - computers that required a bit of hands-on programming and tuning to get the most out of them. Much (not all) of that tinkering culture faded with the advent of graphical interfaces, and later, touch screens, that abstract the nuts and bolts from the end user experience. The evolution of user experience has brought about amazing things, there's less opportunity to "MacGyver" a touch screen.
The Raspberry Pi is a minimalist computer: a processor; a bit of memory; ports for network, video, and sound; an SD card slot for data and operating system storage; a pair of USB ports to attach additional components; and a micro-USB port to supply power. Altogether the Pi costs about $35. You can buy a Pi with a protective case, an SD card, and a power supply for around $50 to $60.
A computer this cheap is no longer a major investment - in fact, in certain cases it can almost be considered disposable. And with a disposable PC have come some really wild uses for a computer.
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I am amazed at the uses for the Pi that have shown up after just 2 years. I cannot wait to see what ingenious inventions show up next!