CBS News Sunday Morning Season 49 Episode 12 Lisa Kudrow, Sen. Cory Booker, Chef Ruthie Rogers

SIGN OF THE TIMES – Jim Axelrod visits Muir Woods in California and the President's House in Philadelphia to see how the Trump Administration's decision to remove signs and materials in national parks is impacting visitors.

LISA KUDROW – Tracy Smith talks with actor Lisa Kudrow ("Friends") about her HBO series "The Comeback," which is making a comeback for the third time.

IN CONVERSATION: CORY BOOKER – Faith Salie sits down with New Jersey Democratic Senator Cory Booker to talk about his life growing up in Newark and his work in Washington, D.C.

ON DISPLAY: ROBERT THERRIEN – Luke Burbank heads to The Broad Museum in Los Angeles to explore a retrospective on the life and work of the late artist Robert Therrien, perhaps best known for his large-scale objects.

SPRING HAS SPRUNG! – David Pogue reports on iNaturalist, a free app that helps identify millions of plant and animal species.

HAIL, CAESAR – Mo Rocca looks at the life and impact of the late comedian Sid Caesar, who in the 1950s was one of TV's most popular performers, the subject of a new book by David Margolick titled When Caesar Was King: How Sid Caesar Reinvented American Comedy.

JUST THE RECIPE – Seth Doane talks with trailblazing American chef Ruthie Rogers about her beloved London restaurant, The River Café, and her podcast and new book, Ruthie's Table 4, where she reminisces with her famous friends about food.

IRAN – David Martin brings us the latest developments from the war with Iran.

OPINION – Author and CBS News contributor Arthur Brooks has some thoughts on the meaning of life.