While not exactly tech related, anyone who can build a homemade nuclear fusion reactor from parts he scrounged up on Ebay is pretty damn smart in my book.
In 2006 Thiago Olson joined the extremely sparse ranks of amateurs worldwide who have achieved nuclear fusion with a home apparatus. In other words, he built the business end of a hydrogen bomb in his basement. The plasma "star in a jar"—shown at the left—emonstrated his success.