A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
140
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
Only about 2% of the world population has green eyes.
36
Lurch, a Watusi bull, had the largest horns in the world.
32
It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
165