It’s not easy to hold a great conversation. But longtime public radio journalist Celeste Headlee has some helpful hints — and a few horror stories. Her new book, “We Need to Talk,” explains the science behind why conversations are so difficult: listening, focusing, empathizing, even knowing when not to speak. Celeste Headlee is our guest. You’ll find her show “On Second Thought” from Georgia Public Broadcasting at gpbnews.org/programs/second-thought