Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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The human brain has the capacity to store everything that you experience.
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Our Right Lungs takes more air than our left lung.
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When you take a step, you are using up to 200 muscles.
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The human brain doesn't stop developing until about 25 years old.
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It takes about 20 seconds for a red blood cell to circle the whole body.
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Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
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