Your thumb is about the same size as your nose.
124
A cow produces around 200,000 glasses of milk in her lifetime.
373
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
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
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