Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
140
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
You forget 90% of your dreams.
256
Cows can sleep standing up, but they can only dream lying down.
745