Go to any random computer forum online and start asking about the cheapest computer ever — the chances are excellent that one of the top answers you get will be the Raspberry Pi, which was designed as a fun little project by the appropriately named Raspberry Pi Foundation. This small motherboard is, well, just that. Amazingly, theres room for a GPU, 4GB of RAM, USB ports, and more on this guy. You can hook it up to pretty much any TV or monitor that you want, and use it with a typical...

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