Sound travels about 4 times faster in water than in air.
408
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Billions of neutrinos pass unnoticed through your body every second.
6
In zero gravity, a candle's flame is round and blue.
16
Cold water weighs more than hot water.
93
One barrel of petroleum holds 42 gallons.
20
German chemists made a replica of a trophy the size of one molecule.
68