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Aviation has had noise-cancelling headsets for over a decade. Much lighter and more effective than heavy sound-deadening material. You are beginning to see snoise-cancelling headsets on target ranges, where hearing loss is a real problem.
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It is illegal to drive with earplugs, ear buds, or headphones on while driving a motor vehicle. Learned that in Driver's ed. Someone in my class argued over that fact, as well as arguing over using them for cell phone conversations.