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Driver safety has been an ongoing evolution since the beginning of motorsport.
In the Indy 500, one huge innovation came in 1916.
For that year's race, two drivers, Peter Henderson and Eddie Rickenbacker, wore steel helmets.
Up until that point, drivers either wore cloth or leather helmets, or, sometimes, just goggles.
In the last 100 years, we've seen several notable leaps in safety technology, but this was one of the first.