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When I did the chemical research ,back in the late 60's, we were told that OSHA said we had to wear hard hats when we went out into the plant.They issued all the researchers yellow hard hats with our name on them. We lab rats were not used to that, but there was no choice. I took two cow horns and used PC7 to attach them to my hat. I figured if I had to wear a stupid hard hat, I might as well look totally dumb.