Since we're about to witness an orgy of Olympian ice-skating tonight, you are probably wondering: What makes ice slippery?
Well, a recent New York Times article attempted to explain it, but you might be surprised that ... nobody knows! Oh yes, there are new theories and long-held beliefs, but it simply hasn't been proven.
It might have to do with the more mobile top layer of atoms on the surface of ice. Or the heat of pressure caused by a skating blade. Or just the heat from friction caused by traveling across it. But nobody knows for sure.
But it might shock you to know that legions of scientists are, at this very moment, trying to find out! Irina Slutskaya probably won't be waiting to find out, but I will.