The first blue-eyed person is said to have lived 6,000-10,000 years ago.

The first blue-eyed person is said to have lived 6,000-10,000 years ago

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Every person, including identical twins, has a unique eye and tongue

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Our eyes are made up of over 2 million working parts

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A blink typically lasts 100-150 milliseconds

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All babies are colour blind at birth

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Your nose gets runny when you cry as the tears drain into your nasal

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An eye is composed of more than 2 million working parts