Mars had an oxygen-rich atmosphere around 4 billion years ago
13
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
Lurch, a Watusi bull, had the largest horns in the world.
32
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
Your body is creating and killing about 2.4 million red blood cells per second.
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Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14