Iron weighs more after it rusts.
16
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
A cesium atom in an atomic clock beats over nine billion times a second.
43
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
A 'jiffy' is an actual unit of time for 1/100th of a second!
66
According to studies, men change their minds two to three times more often than women.
72
Indoor pollution is 10 times more toxic than outdoor pollution.
62
Aluminum used to be more valuable than gold!
84