The adult human brain weighs about 3 pounds (1,300-1,400 g).
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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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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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When you get goosebumps and your hair stands, the hair helps to trap air, making you feel warmer by keeping in your body heat.
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Dogs can be trained to identify the scent of lung cancer long before symptoms develop.
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The human body contains over a billion miles of DNA.
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Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
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