One cubic foot of gold weighs more than 1,200 pounds!
78
German chemists made a replica of a trophy the size of one molecule.
68
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Indoor pollution is 10 times more toxic than outdoor pollution.
62
The bark of an older redwood tree is fireproof.
65
Your brain is 80% water.
525