One ragweed plant can release as many as one billion grains of pollen!
51
One cubic foot of gold weighs more than 1,200 pounds!
78
The average temperature at 40,000 feet above sea level is -60 F.
56
A cesium atom in an atomic clock beats over nine billion times a second.
43
The bark of an older redwood tree is fireproof.
65
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
In zero gravity, a candle's flame is round and blue.
16
Out of all the senses, smell is most closely linked to memory.
146