The typical spec of dust that you see floating in the air is half way in size between the Earth and a subatomic particle.
131
The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
The population of the Earth has more than doubled since 1950.
151
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
Approximately 115 tons of ocean salt spray enters the earth's atmosphere each second.
100
A lightning bolt generates temperatures five times hotter than those found at the sun's surface!
127