When Being Hard-Headed Helps

Hard hats came a long way from caps made of hardened tar in the early 1900s. Today’s are made of heavy-duty plastics and an interior suspension system to soften the blow of objects—making this object one of the 100 That Shaped Public Health.
 
Check GHN every Wednesday for an up-close look at one of the objects that made the list published by the Johns Hopkins Bloomberg School of Public Health.

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