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
The strangers in your dreams are actually people that you've seen in real life.
50
No one knows Albert Einstein's last words. Just before he passed, he spoke several words in German, but his nurse only knew English.
154
A cow produces around 200,000 glasses of milk in her lifetime.
373
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14