Pain occurs when sounds are above 130 db.
124
The human brain is more active during sleep than during the day.
28
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
31
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
The human body contains over a billion miles of DNA.
147
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13