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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One human hair can support 3 ounces.
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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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Your heart will pump about 212 million liters in its lifetime.
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The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
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If your DNA was stretched out it would reach to the moon 6,000 times.
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After age 30, the brain begins to lose about 50,000 neurons per day - shrinking the brain .25% each year.
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