interesting. The linked video covers Moderna and Pfizer, while the others deal specifically with Pfizer and the mRNA technology...a bit "nerdy", but hey it might be helpful to know what's hopefully going into our bodies.
https://www.youtube.com/watch?v=_jwBxZMWrng&feature=youtu.be
https://www.youtube.com/watch?v=JQIwwJqF5D0
Link: https://www.youtube.com/watch?v=eZvsqBCvB00