NanoTongs

Nanoscientists in Tokyo have created the first working nanoscale tool. The iron-based hinge pivots when light hits a photosensitive chemical on the scissors.

From Popular Science: "That flips two molecular paddles at the bottom of the scissors that hold the target object - in this case, a structure of nitrogen atoms - —which obligingly changes its shape. That simple twist is the first step on the way to more useful nanoscale machines."