'Roseanne,' Carl Zimmer

Host Meghna Chakrabarti speaks with Vulture's Kathryn VanArendonk and WBUR's Renee Graham about the decision to cancel the 'Roseanne' reboot. Plus, science writer Carl Zimmer talks about the history of the concept of heredity, and how current cutting edge research could shape its future. Also, sports with Bill Littlefield.