The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
The smell of freshly cut grass is actually a plant distress call.
31
The sun is 330,330 times larger than the earth.
75
Balsa wood is classified as a hard wood!
41
Nylon is made from coal and petroleum.
42
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
In zero gravity, a candle's flame is round and blue.
16