Until the mid-'70s, bike helmets were practically unheard of. Kids&…
<p>Until the mid-'70s, bike helmets were practically unheard of. Kids' heads often went unprotected in the early days of skateboarding, as well.</p> <p>Even in the "Mad Men" era, when primetime commercials for cigarettes were relentless, many parents urged their children not to smoke — often while chain-smoking in the kids' presence. No one studied (or talked about) the effects of secondhand smoke until the early '90s.</p> <p>Child-resistent packaging wasn't legally required until the end of 197
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