The adult human brain weighs about 3 pounds (1,300-1,400 g).
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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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The idea of left brain (logical) and right brain (creative) has no basis in neuroscience and is in fact a myth.
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In one day, adult lungs move about 10,000 litres of air.
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All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.
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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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