I am a member of the Harvard Microbiological society and I recently wrote an article about vaccines fort their blog. In this episode, I read the article out loud!
You can also read the entire article titled "Vaccines - More Than Just a Needle" at 
https://medium.com/@harvardmicrosociety/vaccines-more-than-just-a-needle-b586b26c9a2d

Overall, I think vaccines is one the most interesting topics, because of all the history as well as how they work!

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Thanks for listening, and as always listen, rate, and share!