Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Sound travels fifteen times faster through steel than through air.
134
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Some toothpastes and deodorants contain the same chemicals found in antifreeze.
38
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
One barrel of petroleum holds 42 gallons.
20