Scientists are now able to grow 'beating' heart tissue in a lab!
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Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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The average temperature at 40,000 feet above sea level is -60 F.
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The Earth's atmosphere weighs about 5.5 quadrillion tons.
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When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
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Scientists concluded that the chicken came first, not the egg, because the protein which makes the egg shells is only produced by hens.
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