April 5

Fascinating character, this Dean Kamen. First off, he's the son of comic book artist Jack Kamen, whose cover art helped the EC Horror Comics line (Tales of the Crypt) anchor itself in the imagination of a generation. This has nothing to do with what makes Dean Kamen a great deal, but it's a cool trivia bit for a comic book geek like me.
Dean's energies are focused on inventing; he's amassed over 400 patents, for such inventions as the wearable infusion pump, the stair-climbing wheelchair, and the Segway. He's also started organizations to encourage science and math education in today's schools, to foster the next generation of inventors.
If anybody has a chance of winning a Nobel prize in two categories, I'd put my money on Kamen. Without his brilliance, we wouldn't have moments like this: