Cows can sleep standing up, but they can only dream lying down.
745
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
31
Your thumb is about the same size as your nose.
124
There are so many kinds of apples that if you ate a new one everyday, it would take over 20 years to try them all.
34
Mars had an oxygen-rich atmosphere around 4 billion years ago
13