For some time the university of Stanford has been simulating protein folding using computing power donated by many users accross the globe. This mass simulation will help us better understand the workings of many diseases such as Alzheimer's and Mad cow disease. This donation of computing power will work around the power usage of your machine and will not decrease performance. You simply have to download and run a piece of software.
If you decide to download, use this team number: 176227 and track our donations
For more info go here