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
Wearing tight pants can lead to impotence in men.
120
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
When your face blushes, the lining of your stomach turns red, too.
154
The brain can stay alive for 4 to 6 minutes without oxygen. After that cells begin die.
193
There's 100 trillion good bacteria living in your body.
17