>> mckibben: well, it obviously can't wait.'ve got to pay attention to reality or else you end up getting bit by it, and bit pretty hard, okay? >> wertheim: you're saying flatten another curve? >> mckibben: flatten another curve. flatten the carbon curve too. and-- anif we did that, then people might look back in 50 years at this time and thank us, you know, instead of curse us. because those are the two possibilities. ( ticking ) >> dickerson: this was supposed to be the last broadcast of our season. but seasons are jumbled in the age of covid-19. spring has been taken and summer is thinning. if there is baseball, the season will be shorter and with no fans. the boardwalk might look a little more like it does in winter. it's just one of the ways time has come untethered. days smear into days, when, for many, the commute is just across the living room. weekends lose their shape. every day seems to be tuesday. but there are still 60 minutes in an hour, and for one more month, "60 minutes" on sunday night. we'll be here with new

george mckibben was 76. so many front-line workers have sacrificed their lives caring for others.ngelin castro guzman, a ca-year-old nurse was one of them. her family said she had been isanning a trip to disneyland for her children when she got sick. her youngest was just five months old. messiah howard was only seven. >> are you ready? >> o'donnell: he was a bouncy, happy little boy and a big fan of the new orleans saints, a drew brees action figure was his constant companion. his family said his smile never faded even when he e hospital stays for a rare disease. he was recovering from a bone marrow transplant that was supposed to save his life when he fell ill with covid-19. please know we are thinking of everyone who has lost someone they loved. there is still much more news ahead on tonight's "cbs evening news," including china's violent crackdown on democracy in hong kong. tonight, the trump administration is taking new action. dramatic footage of russian fighter jets buzzing dangerously close to a u.s. navy jet. and later, why some of this year's graduating seniors got to ta