Indoor pollution is 10 times more toxic than outdoor pollution.
62
The average temperature at 40,000 feet above sea level is -60 F.
56
The bark of an older redwood tree is fireproof.
65
Scientists in Germany have developed a candy that doesn't cause cavities.
11
One 75-watt bulb gives more light than three 25-watt bulbs.
57
4.5 pounds of sunlight strike the Earth each day.
27
Out of all the senses, smell is most closely linked to memory.
146