Blue-eyed people share a common ancestor with every other blue-eyed person in the world.

Blue-eyed people share a common ancestor with every other blue-eyed

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A strange condition known as ‘alien hand syndrome’ can affect people

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A healthy (non-colorblind) human eye can distinguish between 500 shades

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A blink typically lasts 100-150 milliseconds

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Your brain uses about the same amount of power as a ten watt bulb

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Blondes generally have more hairs on their head (145,000) than brunettes