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
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
81
A cow produces around 200,000 glasses of milk in her lifetime.
373
The University of Oxford (teaching since 1096) predates the Aztec empire (1428 - 1521).
14