Blond hair in humans developed only 11,000 years ago as an…

Blond hair in humans developed only 11,000 years ago as an evolutionary response to the lack of sunlight in Northern Europe to enable more Vitamin D synthesis. source

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mindblowingfactz:The ‘hedgehog’s dilemma’ refers to the…

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The ‘hedgehog’s dilemma’ refers to the animal’s inability to cuddle for warmth because of its sharp spines, and is a metaphor for the difficulty of human intimacy. It suggests that even those with good intentions can’t be intimate without harming each other, and is used to explain introversion and isolationism. (source)

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When a crow dies, the other crows investigate if there’s…

When a crow dies, the other crows investigate if there’s a threat where the death occurred, so they can avoid it in the future. source

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