In zero gravity, a candle's flame is round and blue.
16
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Nearly 50% of the world's scientists are assigned to military projects.
71
One third of the electricity produced on earth is used to power electric light bulbs!
75
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Aluminum used to be more valuable than gold!
84
A single speck of dust is half way in size between a subatomic particle and the Earth.
15