Why It Actually Took 50 Years to Make COVID mRNA Vaccines

The FDA recently approved two mRNA vaccines for COVID-19, but it was a challenge to make this type of vaccine work. And it took decades of research to get us to the point where scientists could make those vaccines as quickly as they did.

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Images:
https://commons.wikimedia.org/wiki/File:Moderna_COVID-19_vaccine.jpg
https://commons.wikimedia.org/wiki/File:PDB_1ucg_EBI.jpg
https://commons.wikimedia.org/wiki/File:PDB_1bol_EBI.jpg
https://commons.wikimedia.org/wiki/File:PDB_1ucd_EBI.jpg
https://commons.wikimedia.org/wiki/File:PDB_2rln_EBI.jpg
https://commons.wikimedia.org/wiki/File:MRNA_structure.svg
https://commons.wikimedia.org/wiki/File:SolidLipidNanoparticle.jpg
https://commons.wikimedia.org/wiki/File:SARS_virion.gif
https://phil.cdc.gov/Details.aspx?pid=15906
https://www.thingiverse.com/thing:3146686