Join former NYT Science Times editor David Corcoran for a discussion with popular science writer and prolific book author Carl Zimmer about the history of heredity, and why you can’t boil down something as complex as intelligence to a couple of genes. Also, podcast host Kasha Patel talks with Undark’s Matters of Fact and Tracker columnist Michael Schulson about the safety of CBD, or cannabidiol, for dogs; and science journalist Anja Krieger takes listeners to the small German town of Schleswig, where a major leak has sparked a big debate.