One of the world's leading astrophysicists, Neil deGrasse Tyson is also a scientist-celebrity, and he accordingly gets a lot of mail. Here he presents 101 letters he has received from people worldwide—children, soldiers, teachers, inmates—along with his candid, thoughtful, often surprising answers. With the same clarity he brought to Astrophysics for People in a Hurry, Tyson discusses black holes, intelligent design, race, parenting, and the Pluto debate, but also ESP, Bigfoot, numerology, and the Flat Earth controversy; here too is Tyson's moving eulogy for his father.