Indoor pollution is 10 times more toxic than outdoor pollution.
62
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
A cesium atom in an atomic clock beats over nine billion times a second.
43
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Cold water weighs more than hot water.
93
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Liquid TIDE laundry detergent glows under a blacklight.
96