In zero gravity, a candle's flame is round and blue.
16
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
A cubic yard of air weighs about 2 pounds at sea level.
31
MIT has developed a camera that captures the speed of light at a trillion frames per second.
20
A ball of glass will bounce higher than a ball made of rubber.
73
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
According to studies, men change their minds two to three times more often than women.
72