After age 30, the brain begins to lose about 50,000 neurons per day - shrinking the brain .25% each year.
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The average sperm cell swims at 8 inches per hour.
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Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
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It takes about 20 seconds for a red blood cell to circle the whole body.
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The largest cell in the human body is the female egg and the smallest is the male sperm.
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Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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Poor eyesight (myopia) is associated with higher IQ.
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The adult human brain weighs about 3 pounds (1,300-1,400 g).
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