(2)A team of Bio-Nano Robotics researchers from Rutgers and several other universities have created an animation showing how a nano-robot could theoretically travel inside the body and destroy harmful cells. More info here(1).
Watch the video:
Win
Credit: Rutgers University

1. http://bionano.rutgers.edu/mru.html
2. http://mfile.akamai.com/5022/wmv/coast.download.akamai.com/5022/video/ru_nanorobot_animation-1.asx