One 75-watt bulb gives more light than three 25-watt bulbs.
57
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
In zero gravity, a candle's flame is round and blue.
16
Iron weighs more after it rusts.
68
One cubic foot of gold weighs more than 1,200 pounds!
78
German chemists made a replica of a trophy the size of one molecule.
68
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116