Your body is creating and killing about 2.4 million red blood cells per second.
17
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
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
The average sperm cell swims at 8 inches per hour.
76
You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
17
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
