Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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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.
73
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
Enamel is hardest substance in the human body.
61
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 heart will pump about 212 million liters in its lifetime.
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