Host Ira Glass talks with Rebecca, who, using perfectly valid evidence, arrived at the perfectly incorrect conclusion that her neighbor, Ronnie Loeberfeld, was the tooth fairy. We hear her story. Ira also talks with Dr. Alison Gopnik, co-author of the book, The Scientist in the Crib, about what exactly kid logic is. Alison is also author of The Philosophical Baby.(6 minutes) Childhood • Family • Fathers • Funny