David Letterman, Aurel Bacs, Jim Gaffigan

LEGACY – David Pogue talks to the late Harry Chapin's children about the singer's legacy, his charities and the 1974 song that came to represent father and son relationships across generations: "Cat's in the Cradle."
LEGENDS – Mo Rocca delves into the life of Desi Arnaz and how he changed television forever. Lucie Arnaz Luckinbill, Desi and Lucille Ball's daughter, and Todd Purdum, the author of a new biography about Arnaz, speak with Mo about the performer's impact and legacy.
DRIVEN! – Tracy Smith drives into the world of IndyCar racing, speaking with David Letterman, who has co-owned an IndyCar team since 1996, and drivers Josef Newgarden, Pato O'Ward and Mario Andretti.
A CAN OF WORMS – Ever heard of worm grunting? Conor Knighton fills you in with a visit to Sopchoppy, Fla., and its Worm Gruntin' Festival.
TIME IS MONEY – Mark Strassmann takes us to a Swiss watch auction and speaks with star auctioneer and businessman Aurel Bacs in Zurich.
250th ANNIVERSARY OF THE ARMY – David Martin shares a history of the Army to honor its 250th anniversary, visiting a new exhibit at the National Museum of the United States Army.
ARMY PARADE – Robert Costa reports on the weekend's U.S. Army parade in Washington, D.C., and protests around the country.
OPINION – Jim Gaffigan's son, Patrick, has some thoughts on his dad.
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