It takes approximately 12 hours for food to entirely digest.
93
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
Tigers can see 6 times better at night than humans.
305
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
It has been scientifically proven that stroking a cat can lower one's blood pressure!
456
In one day, adult lungs move about 10,000 litres of air.
11
It takes about 20 seconds for a red blood cell to circle the whole body.
102