Brass doorknobs automatically disinfect themselves in about 8 hours.
18
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Hot water can freeze faster than cold water.
181
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Scientists in Germany have developed a candy that doesn't cause cavities.
11
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116