Guest host: Lee Cowan. In our cover story, NPR's Allison Aubrey examines how medical staff from Johns Hopkins are joining forces with "trusted messengers" in the Baltimore community to improve health outcomes for African Americans facing coronavirus. Plus: Seth Doane reports on the economic fallout in Rome due to an absence of American tourists; Mo Rocca talks with actress Melissa Gilbert about life lessons learned from "Little House on the Prairie"; Bill Whitaker sits down with chef Dominique Crenn, the first woman in America to receive three Michelin stars; Jim Axelrod interviews ?Daily Show? host Trevor Noah; Lee Cowan explores how residents in rich and poor areas of Shreveport, La., are extending themselves to their neighbors to build a more caring community; and Martha Stewart discusses the inspirations for, and benefits from, creating a beautiful, subtle and colorful garden.