Nylon is made from coal and petroleum.
42
Sound travels about 4 times faster in water than in air.
408
Some toothpastes and deodorants contain the same chemicals found in antifreeze.
38
Indoor pollution is 10 times more toxic than outdoor pollution.
62
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
In zero gravity, a candle's flame is round and blue.
16
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21