Beacouse the most cutting-edge computer is our brain.
Foldit is a revolutionary new computer game enabling you to contribute to important scientific research.
From what i read on the website, they present the player with a puzzle-game, they plan (if premises are true) to teach computers the human strategies to fold proteins faster than ever.
This proteins researches involves to help find a cure for cancer, hiv (aids) and alzheimer, as well as developing more efficient bio-fuel.
Link Fold.it (the game)
Link Folding AT Home (the distribuited processing calculations)
