Right now vaccinations are all over the news. There are many companies that have developed vaccines for COVID-19 and there is a good chance that most people in the world will wind up getting a vaccine in the next year or two.

Many of you may never have given much thought to what is a vaccine? How do they work, and how were they developed?

Well, there are answers to those questions.

Learn more about the history of vaccines and how they work on this episode of Everything Everywhere Daily.
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