In our cover story, Susan Spencer meets a pioneer in the study of stroke recovery. David Pogue explains the GameStop stock battle pitting Wall Street hedge funds against day traders. Mo Rocca talks with Mark Harris, author of a new biography of director Mike Nichols. Holly Williams profiles actor and Negroni-mixer Stanley Tucci. and Martha Teichner tells the story behind her new book, "When Harry Met Minnie," a true tale of puppy love and friendship. Mo Rocca guest hosts this week's "CBS Sunday Morning."

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