A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
140
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Your thumb is about the same size as your nose.
124
You forget 90% of your dreams.
256
A cow produces around 200,000 glasses of milk in her lifetime.
373
Cows can sleep standing up, but they can only dream lying down.
745
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14