The adult human brain weighs about 3 pounds (1,300-1,400 g).
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The human brain uses approximately as much energy as a 10 watt light bulb.
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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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Enamel is hardest substance in the human body.
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An Indian man known as "Snake Manu" can put small snakes, including deadly cobras, into his mouth and pass them out through his nose.
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The average sperm cell swims at 8 inches per hour.
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One human hair can support 3 ounces.
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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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