Iron weighs more after it rusts.
16
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
According to studies, men change their minds two to three times more often than women.
72
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
A cesium atom in an atomic clock beats over nine billion times a second.
43
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
The force of a suction cup is calculated using F=AP.
15
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