ROBOTS THAT REPLICATE AND EVOLVE. “By supplying and removing ‘fuel strands’ that drive strand pairing and unpairing, it is possible to make molecular-scale machines that move, such as DNA ‘walkers’ that stride along guide strands. Eventually such DNA systems might be given the ability to replicate and evolve.”
http://philipball.blogspot.com.es/2014/06/programmable-matter-kicks-off.html