Cows can sleep standing up, but they can only dream lying down.
745
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
If Earth's history was condensed into twenty-four hours, life would've appeared at around 4am, land plants at 10:24pm, dinosaur extinction at 11:41pm, and human history would’ve began at 11:58:43pm.
21
A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
140
Only about 2% of the world population has green eyes.
36
Your thumb is about the same size as your nose.
124
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3