Pumice is the only rock that floats on water.
14
Research indicates that plants grow healthier when they are stroked.
173
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
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
Scientists in Germany have developed a candy that doesn't cause cavities.
11
Diamonds can be shattered with a hammer.
-104
The use of emoticons affects our corresponding brain areas and can actually trigger emotions.
21