Human thigh bones are stronger than concrete!
63
From the age of thirty, humans gradually begin to shrink in size.
1
When you look up at the blue sky and see white dots flying around, you’re actually seeing your own white blood cells.
30
If you are cold you are more likely to be hungry because you use energy to keep warm.
144
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
The tongue is the strongest muscle in the human body.
50
The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21
Every hour one billion cells in the body must be replaced.
17