- Hard hats, worn by construction workers, were first used in the building of the Hoover Dam in 1933.
- Hydrogen is the most common atom in the universe.
- If all of the gold sitting in the oceans and seas were mined, every person in the world would get about 44 pounds of gold each.
- In Australia, a dust devil is called a “”willy-willy.””
- Central air conditioners use 98 percent more energy than ceiling fans.
