Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
Indoor pollution is 10 times more toxic than outdoor pollution.
62
In the 60s, a scientist gave LSD to dolphins in an attempt to teach them English.
17
Sound travels about 4 times faster in water than in air.
408
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Scientists concluded that the chicken came first, not the egg, because the protein which makes the egg shells is only produced by hens.
11
One barrel of petroleum holds 42 gallons.
20