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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Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
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It takes twice as long to lose new muscle if you stop working out than it did to gain it.
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When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
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In one day, adult lungs move about 10,000 litres of air.
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Enamel is hardest substance in the human body.
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On average a woman has 4 sexual partners in her lifetime.
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