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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On average, there's 100 billion neurons in the human brain.
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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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The human eye blinks an average of 4,200,000 times a year.
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Mushrooms are more closely related to humans than they are to plants.
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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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Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
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Yawns are more contagious among people with closer relationships.
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