More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
17
According to a 2011 poll, 32% of Russians believe that the Sun orbits Earth.
11
In 1963, the US Military created an artificial ring around Earth, similar to that of the planet Saturn. The ring was made of copper needles and was used for worldwide communications in the case that the Soviets disabled all other methods of communication.
26
There are approximately three chickens for every human on Earth.
13
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
Earth is the only planet in our solar system that's not named after a god or goddess.
17
A single speck of dust is half way in size between a subatomic particle and the Earth.
15