The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
Nylon is made from coal and petroleum.
42
Iron weighs more after it rusts.
68
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
In zero gravity, a candle's flame is round and blue.
16
Each day, up to 150 species of life become extinct.
-23