One 75-watt bulb gives more light than three 25-watt bulbs.
57
One third of the electricity produced on earth is used to power electric light bulbs!
75
Indoor pollution is 10 times more toxic than outdoor pollution.
62
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Billions of neutrinos pass unnoticed through your body every second.
6
A cesium atom in an atomic clock beats over nine billion times a second.
43
Hot water can freeze faster than cold water.
181
Your brain is 80% water.
525