Work sites always have a lot going on, which is why it's important to stay organized. The different hard hat colors help show at a glance what job everyone has.

Edward W. Bullard invented the hard hat in 1919, then patented it in 1929. ... Some 33 million Americans, about 10 percent of the national population, work hard-hat jobs today.

The WaveCel hard hat tries to prevent those head spins from tearing up brains in the first place. Made of thin neon-green plastic, it’s a kind of zigzag grid of cells, with walls that stack on ...

"The places we climb, you need to be a gymnast or contortionist to get up," said bridge worker Jay Seaman. He must wear a hard hat. It's mandatory.