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 study by the National Science Foundation, only half of Americans believe in evolution, and one in 4 don't know that the Earth orbits the Sun.
14
The Earth sees about 760 thunderstorms every hour, scientists have calculated.
185
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
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
Ants make up 1/10 of the total world animal tissue. The total biomass of all the ants on Earth is about equal to the total biomass of all the people.
85
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