Cows can sleep standing up, but they can only dream lying down.
745
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
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
The University of Oxford (teaching since 1096) predates the Aztec empire (1428 - 1521).
14
The strangers in your dreams are actually people that you've seen in real life.
50
Your body is creating and killing about 2.4 million red blood cells per second.
17
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
31