Spiders at the nanoscale: Molecules that behave like robots
A team of scientists has programmed an autonomous molecular robot made out of DNA to start, move, turn, and stop while following a DNA track. The development could ultimately lead to molecular systems that might be used for medical therapeutic devices and molecular-scale reconfigurable robots — robots made of many simple units that can reposition or even rebuild themselves to accomplish different tasks.
More Info: http://www.sciencedaily.com/releases/2010/05/100512131515.htm