Cows can sleep standing up, but they can only dream lying down.
745
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Your body is creating and killing about 2.4 million red blood cells per second.
17
The strangers in your dreams are actually people that you've seen in real life.
50
Lurch, a Watusi bull, had the largest horns in the world.
32
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82