/u/redditho24602's posts in /r/askscience

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You know [those monkeys in Japan that hang out in hot springs](http://en.m.wikipedia.org/wiki/File:Snow_Monkeys,_Nagano,_Japan.JPG)? How come they don't get hypothermia?

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When a cat looks surprised, how do we know it looks surprised? When did facial expressions evolve, and has there been any study of whether/how they correlate across species?

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When a cat looks worried, is it? Do the facial expressions/musculature that indicate emotions in humans work across all mammal species? How far back did they evolve?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
You know [those monkeys in Japan that hang out in hot springs](http://en.m.wikipedia.org/wiki/File:Snow_Monkeys,_Nagano,_Japan.JPG)? How come they don't get hypothermia?	1
When a cat looks surprised, how do we know it looks surprised? When did facial expressions evolve, and has there been any study of whether/how they correlate across species?	1
When a cat looks worried, is it? Do the facial expressions/musculature that indicate emotions in humans work across all mammal species? How far back did they evolve?	1