The adult human brain weighs about 3 pounds (1,300-1,400 g).
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We forget why we have entered a room because passing through doors creates an ‘event boundary’ causing the brain to file away what we were just thinking about.
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When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
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Our eyes are always the same size from birth, but our nose and ears never stop growing.
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Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
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By weight, Bone is five times stronger than steel.
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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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