4.5 pounds of sunlight strike the Earth each day.
27
Most dust particles in your house are made from dead skin!
67
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Sound travels about 4 times faster in water than in air.
408
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7