Walter Isaacson shares experience with Pfizer vaccine trial

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Walter Isaacson, the author of "The Code Breaker: Jennifer Doudna, Gene Editing, and the Future of the Human Race," joins Andrea Mitchell to discuss his experience participating in Pfizer's Covid-19 vaccine trial. Isaacson says, "There's no bravery here, this thing is totally safe, but just like you do jury duty or maybe vote or whatever it may be, the notion of participating in a clinical trial is something we all can do."