A single speck of dust is half way in size between a subatomic particle and the Earth.
15
The sun is 330,330 times larger than the earth.
75
For every gallon of sea water, you get more than a quarter pound of salt.
45
In zero gravity, a candle's flame is round and blue.
16
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
Most dust particles in your house come from dead skin.
48