Using some science I really don't quite have a grasp on, chemists Paul Rothemund and Erik Winfree of the California Institute of Technology have created artificial DNA thanks to a technique called "DNA origami." This artificial DNA is capable of building itself into (slightly) larger structures, and could apparently be useful in nanocomputing (to create teeny tiny electrical circuits, for example).

But mainly, it's really quite cool and more than a little spooky (in my non-scientific opinion).