Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
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Tigers can see 6 times better at night than humans.
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There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
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There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
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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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The adult human brain weighs about 3 pounds (1,300-1,400 g).
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Obsessive nose picking is called Rhinotillexomania.
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Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
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