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.

It’s an oft-cited science “fact” that ice is slippery due to pressure or friction, but this explanation doesn’t explain why ice’s slippery behavior remains at temperatures where such melting isn’t ...

[CLIP: Skates cut across the ice at an ice rink, and music plays in the background.] Kendra Pierre-Louis: So we’re out here today in lower Manhattan ice-skating. There are lots of kids skating around, ...

The reason we can gracefully glide on an ice-skating rink or clumsily slip on an icy sidewalk is that the surface of ice is coated by a thin watery layer. Scientists generally agree that this ...

The original version of this story appeared in Quanta Magazine. The reason we can gracefully glide on an ice-skating rink or clumsily slip on an icy sidewalk is that the surface of ice is coated by a ...