The adult human brain weighs about 3 pounds (1,300-1,400 g).
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For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
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The average person's skin weighs twice as much as their brain.
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Every year your body replaces 98% of your atoms.
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Your thumb is about the same size as your nose.
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Our Right Lungs takes more air than our left lung.
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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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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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