An enterprising hacker has created a working "difference engine" -- a mechanical calculator first attempted in 19th Century by Charles Babbage -- out of legos. The difference engine was immortalized in the William Gibson/Bruce Sterling collaboration of the same name, and it's a perpetual source of hacker fascination (Ada Lovelace, Lord Byron's daughter, financed the project and invented the idea of software for it because she was interested in handicapping horse races). Though Babbage was never able to get his design working, London's science museum did build a Babbage Engine that worked, thanks to the greater precision of twentieth-century machining techniques.
Ha ha! Even in the very FIRST uses of computers, people were trying to figure out to handicap the ponies!!!
I don't feel like such a geek, now.