The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
Neil Armstrong, the first man to step foot on the moon, carried with him a piece of cloth and wood from the original 1903 Wright Flyer.
12
If two pieces of metal touch in space, they become permanently stuck together.
808
There are 5 to 10 times more stars in the known Universe than there are grains of sand on all the world's beaches, but a single grain of sand has more atoms than there are stars in the known Universe.
20
The heart of an astronaut actually gets smaller when in outer space.
216
Only 55% of Americans know that the sun is a star.
986