Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
It takes approximately 12 hours for food to entirely digest.
93
Tigers can see 6 times better at night than humans.
305
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
Every human spent about half an hour as a single cell.
144