In zero gravity, a candle's flame is round and blue.
16
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
Out of all the senses, smell is most closely linked to memory.
146
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Hot water can freeze faster than cold water.
181
One third of the electricity produced on earth is used to power electric light bulbs!
75
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Research indicates that plants grow healthier when they are stroked.
173