The strangers in your dreams are actually people that you've seen in real life.
50
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
140
There are so many kinds of apples that if you ate a new one everyday, it would take over 20 years to try them all.
34
Lurch, a Watusi bull, had the largest horns in the world.
32