Iron weighs more after it rusts.
16
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
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
Research indicates that plants grow healthier when they are stroked.
173
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
The average temperature at 40,000 feet above sea level is -60 F.
56
Out of all the senses, smell is most closely linked to memory.
146