The population of the Earth has more than doubled since 1950.
151
A comet's tail always points away from the sun.
2
Astronauts cannot burp in space.
232
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
277
41% of the moon is not visible from earth at any time.
103
There are two golf balls sitting on the moon.
721