Your body is creating and killing about 2.4 million red blood cells per second.
17
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
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
Lurch, a Watusi bull, had the largest horns in the world.
32
The strangers in your dreams are actually people that you've seen in real life.
50