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发表于:2018-12-07 / 阅读(48) / 评论(0)

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Why Does Spot Have Spots? In dogs with multicolored coats, white areas have no pigment cells. Black, brown or yellow areas, on the other hand, get their color from special pigment cells. When a dog is just an embryo, these pigment cells travel from t

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美国国家公共电台 NPR Scientists Find A Brain Circuit That Could Explain Seasonal Depression

NOEL KING, HOST: Today is the winter solstice. It's the shortest day of the year, and this is also a time of year when a lot of people feel down or depressed. Now scientists think they have new information on why short days lead to such dark moods. N

发表于:2019-02-21 / 阅读(47) / 评论(0)

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