Enamel is hardest substance in the human body.
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Your body is creating and killing about 2.4 million red blood cells per second.
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It takes about 20 seconds for a red blood cell to circle the whole body.
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Our Right Lungs takes more air than our left lung.
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The human brain doesn't stop developing until about 25 years old.
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Your thumb is about the same size as your nose.
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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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