Folding (Folding @ Home), is a project by Stanford University. It's a program that you run, on your computer, and it folds proteins. Protein folding, helps scientists, understand illnesses better, which could lead to finding a cure, to various diseases, such as cancer. They do this because, it's better to use a million of the PCs at home, currently registered for this project, then spending billions of dollars, to build a supercomputer.