World's tiniest snowman...

is just 0.01 mm wide, about one-fifth the width of a human hair. "It was assembled using tools designed to manipulate nano-particles, and welded together with tiny deposits of platinum. A focused ion beam was used to carve the eyes and smile, and to place the platinum nose."

Here's more about how these geeky scientists celebrate the holidays with a neato video.

Image credit: David Cox,Quantum Detection group, National Physical Laboratory, UK.