Sound travels fifteen times faster through steel than through air.
134
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
In zero gravity, a candle's flame is round and blue.
16
Hot water can freeze faster than cold water.
181
Nearly 50% of the world's scientists are assigned to military projects.
71
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Brass doorknobs automatically disinfect themselves in about 8 hours.
18