For every gallon of sea water, you get more than a quarter pound of salt.
45
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
Cold water weighs more than hot water.
93
Scientists have developed a microparticle filled with oxygen that can be injected into the blood stream, enabling us to live without breathing.
21
Iron weighs more after it rusts.
68
A cesium atom in an atomic clock beats over nine billion times a second.
43