Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
There are about 255 babies born worldwide every minute.
46
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
Enamel is hardest substance in the human body.
61