A cubic yard of air weighs about 2 pounds at sea level.
31
Most dust particles in your house come from dead skin.
48
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Indoor pollution is 10 times more toxic than outdoor pollution.
62
Some toothpastes and deodorants contain the same chemicals found in antifreeze.
38
In the 60s, a scientist gave LSD to dolphins in an attempt to teach them English.
17
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
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65