While we can detect 10 million unique colours, we are all colour blind from birth.

While we can detect 10 million unique colours, we are all colour blind

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Your eyelashes keep dirt out of your eyes

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Blue eyes are the most sensitive to light, dark brown the least

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The muscles which help your eyes to focus complete around 100,000

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The average ejaculation releases around three hundred million sperm

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When you swallow, your food travels down your oesophagus to your stomach