Pumice is the only rock that floats on water.
14
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
A cubic yard of air weighs about 2 pounds at sea level.
31
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
The smell of freshly cut grass is actually a plant distress call.
31
Most dust particles in your house come from dead skin.
48
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39