Why mRNA Vaccines Were Insanely Difficult to Make (it took 50 years!)

Why are vaccines so hard to make? The FDA approved two mRNA vaccines for COVID-19, but it was a challenge to make this type of vaccine work. In fact, it took decades of research to get us to the point where scientists could make those vaccines as quickly as they did! Learn all about it with Hank in this new episode of SciShow!

Hosted by: Hank Green

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