The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Diamonds can be shattered with a hammer.
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Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
One 75-watt bulb gives more light than three 25-watt bulbs.
57
German chemists made a replica of a trophy the size of one molecule.
68