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        Part of It's Okay To Be Smart
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        Why Vaccines Work | It's Okay to Be Smart | PBS Digital Studios

        As more and more parents are choosing not to vaccinate their children or are vaccinating them later, diseases like measles are making a comeback. Are vaccines safe? How do vaccines work? Why do some people claim there is a link between vaccines and autism? This week we look at why are people afraid of something that has saved so many lives, and look at the history and science of vaccines.

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