Iron weighs more after it rusts.
68
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
One barrel of petroleum holds 42 gallons.
20
Billions of neutrinos pass unnoticed through your body every second.
6
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Indoor pollution is 10 times more toxic than outdoor pollution.
62
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116