On this edition of Conversations, author Philip C. Stead and illustrator Erin E. Stead talk with host Dan Skinner about “Amos McGee Misses the Bus.” The Steads created the 2011 Caldecott Medal book, “A Sick Day for Amos McGee,” as well as “Bear Has a Story to Tell,” an E.B. White Honor Book. They also collaborated on “Lenny and Lucy,” and independently have written and illustrated numerous other books.