In zero gravity, a candle's flame is round and blue.
16
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
A 'jiffy' is an actual unit of time for 1/100th of a second!
66
Each day, up to 150 species of life become extinct.
-23
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
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Sound travels fifteen times faster through steel than through air.
134
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39