One 75-watt bulb gives more light than three 25-watt bulbs.
57
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
Hot water can freeze faster than cold water.
181
In zero gravity, a candle's flame is round and blue.
16
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Scientists in Germany have developed a candy that doesn't cause cavities.
11
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57