Correspondent Martha Teichner looks at the race to develop a COVID-19 vaccine. Rita Braver finds out how some regional theaters -- that are reopening -- are making big changes to accommodate social distancing; Faith Salie reflects on the “K-word" all too common on social media these days – calling someone a “Karen. " Mo Rocca talks with chef, restaurateur and Food Network host Guy Fieri. Documentary filmmaker Ken Burns looks at the role that baseball has played in American society -- especially in times of crisis, And we present Seth Doane’s award-winning 2019 report about the “Cemetery Angel,” Ruth Coker Burks. Those stories on this week's CBS Sunday Morning.