Your body is creating and killing about 2.4 million red blood cells per second.
17
Only about 2% of the world population has green eyes.
36
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Cows can sleep standing up, but they can only dream lying down.
745
If you have 1 billion dollars and spend $1,000 every day, it would take you 2,740 years to go broke.
31
A cow produces around 200,000 glasses of milk in her lifetime.
373
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