Cows can sleep standing up, but they can only dream lying down.
745
Only about 2% of the world population has green eyes.
36
Not only are there rogue planets floating through space completely alone, not orbiting any stars, but it’s possible that these pitch-black lonely planets support life.
14
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
The University of Oxford (teaching since 1096) predates the Aztec empire (1428 - 1521).
14
A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
140
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14