Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
Indoor pollution is 10 times more toxic than outdoor pollution.
62
The smell of freshly cut grass is actually a plant distress call.
31
For every gallon of sea water, you get more than a quarter pound of salt.
45
The bark of an older redwood tree is fireproof.
65
A ball of glass will bounce higher than a ball made of rubber.
73
A single speck of dust is half way in size between a subatomic particle and the Earth.
15