Cows can sleep standing up, but they can only dream lying down.
745
Only about 2% of the world population has green eyes.
36
Your thumb is about the same size as your nose.
124
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
31
It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
165