Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Sound travels about 4 times faster in water than in air.
408
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
5
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65