Why doesn't Dr. Ruth talk about her sex life? What keeps Michael J. Fox optimistic? Why does Isabella Rossellini have a passion for animals? What's the strangest question someone ever asked Tina Fey? How do Sarah Vowell and Sarah Silverman stop compulsive talkers? Our guests have hilarious, thoughtful, and heartwarming answers to Alan Alda's "7 Questions" -- in this episode, we bring you all of our favorites.