In Ancient Greece, small penises were desirable, and big ones were for ‘old men and barbarians’
22
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
There are about 1,400 different species of bacteria in your belly button.
10
Held in farts enter your bloodstream and are bad for your body.
26
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
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
There's 100 trillion good bacteria living in your body.
17