Pumice is the only rock that floats on water.
14
Diamonds can be shattered with a hammer.
-104
The bark of an older redwood tree is fireproof.
65
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
Billions of neutrinos pass unnoticed through your body every second.
6
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
The sun is 330,330 times larger than the earth.
75