The adult human brain weighs about 3 pounds (1,300-1,400 g).
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You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
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Your heart will pump about 212 million liters in its lifetime.
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Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
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There's 100 trillion good bacteria living in your body.
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Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
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