Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
In zero gravity, a candle's flame is round and blue.
16
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Scientists are attempting to create a synthetic brain by reverse-engineering the mammalian brain down to the molecular level. A cellular human brain is predicted possible by 2023. It hopes to shed light on consciousness.
10
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
German chemists made a replica of a trophy the size of one molecule.
68
Hot water can freeze faster than cold water.
181
