A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
140
The Lion's Mane Jellyfish is the largest jellyfish in the world. They have been swimming in arctic waters since before the dinosaurs (over 650 million years ago).
12
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
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
It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
165