Callard's three kids, ages 11, 16 and 21, plus her husband and ex-husband - who all live together - took part in the discussion. They traded ideas on science and metaphysics, the meaning of life and ethics, what is empirical and what isn't. When one of her kids started talking about Wittgenstein, I couldn't help feeling my own family conversations were sorely lacking. (Callard sent me a recording of the 25-minute discussion. You can listen to a 3-minute clip below.) The intensity of the Callard's dinner discussion epitomizes the philosopher herself. In our conversation about her new book Open Socrates: The Case for a Philosophical Life, she was as provocative as she was insightful.