It lets scientist use your computer power(when your idling) to understand protein folding(what ever that is) which in turn help to find cures for dieseases(dont ask me how) but I think everyone should have this I got it bout 2 years ago and beleive it or not, they're are teams that compete to have the most folding "points" as they call it. I've created a team called "The Fight To Cure", heres the number: 48227. If you do decide to help out, after you install the program you can input a team number to join it.
For more info: www.folding.standford.edu or http://clintdavis.us/downloads/Folding.pdf