In zero gravity, a candle's flame is round and blue.
16
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Liquid TIDE laundry detergent glows under a blacklight.
96
4.5 pounds of sunlight strike the Earth each day.
27
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
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
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101