Your thumb is about the same size as your nose.
124
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
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.
15
Enamel is hardest substance in the human body.
61
Mushrooms are more closely related to humans than they are to plants.
47
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197