Today on Boston Public Radio: We opened the lines to get listener reactions to Tom Brady announcing his retirement from football. Medical ethicist Art Caplan discussed a new report in JAMA about greed in the US healthcare system, our worsening health outcomes, and new FDA guidelines on who can give blood. National security expert Juliette Kayyem discussed the police killing of Tyre Nichols, and the progression of Trump's legal case in Manhattan. Michael Kirk, director of Frontline's latest film "Putin and the Presidents," discussed the film's examination of Russian President Vladimir Putin's quest for Russian dominance through the lens of multiple American presidencies. Food policy writer Corby Kummer discussed the much anticipated Comfort Kitchen opening in Boston, inflation drawing a new generation of bakers to the bread machine, and the legacy of Four Loko. Naturalist and author Sy Montgomery discussed animals genetically modifying themselves to adapt to life in the city, and wildlife advocates urging regulators to do more to protect cephalopods given their intelligence. We opened the lines to hear from listeners about how often they shower.