When you step onto an icy sidewalk or push off on skis, the surface can seem to vanish beneath you. For more than a century, scientists have debated why ice stays slippery, even well below freezing.

Add Yahoo as a preferred source to see more of our stories on Google. DENVER (KDVR) — Snow is wrapping up in Denver on Friday afternoon, and while the roadways might look clear, the weather is gearing ...