The human brain has the capacity to store everything that you experience.
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The adult human brain weighs about 3 pounds (1,300-1,400 g).
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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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Enamel is hardest substance in the human body.
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The human brain doesn't stop developing until about 25 years old.
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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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