[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, ...

PORTLAND, Oregon — Ice seems simple. Frozen water. End of story. But ask why it’s slippery, and suddenly you’re deep into molecular physics — with implications that stretch from Olympic ice rinks to ...

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