When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
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We share 70% of our DNA with a slug.
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Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
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On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
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Fingers prune underwater not because of them absorbing the water or washing away the oil, but because of an evolutionary trait caused by the brain to enhance the grip of your fingers underwater.
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In one day, adult lungs move about 10,000 litres of air.
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