Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
Sound travels fifteen times faster through steel than through air.
134
Sound at the right vibration can bore holes through a solid object.
134
The average temperature at 40,000 feet above sea level is -60 F.
56
Pure water (H2O) does not conduct electricity on its own.
46
A ball of glass will bounce higher than a ball made of rubber.
73
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
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