It’s not often that health researchers find themselves numbered on “influencer” lists with folks such as Elon Musk, Serena Williams, Joe Rogan, Demi Moore and Donald Trump.

Person to Person: Norah O'Donnell interviews Serena Williams Serena Williams is sharing a recent health scare — having a benign branchial cyst "the size of a small grapefruit" removed from her neck.