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.
21
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
It takes approximately 12 hours for food to entirely digest.
93
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
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
You can't tickle yourself.
29