It only takes your body around thirteen minutes to produce enough heat to boil one litre of water.

It only takes your body around thirteen minutes to produce enough heat

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Our eyes are always the same size from birth, but our nose and ears

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Just behind our pupil is the lens – which is round, flat and thicker

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A quarter of the bones in your body are in your feet

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Your eyes focus on 50 different objects every second

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To protect our eyes they are positioned in a hollowed eye socket, while