One cubic foot of gold weighs more than 1,200 pounds!
78
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Pure water (H2O) does not conduct electricity on its own.
46
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
German chemists made a replica of a trophy the size of one molecule.
68
Aluminum used to be more valuable than gold!
84
The earth is approx. 6,588,000,000,000,000,000 tons.
175