Julie Byard, head of a Detroit nursery, tells children stories and sings them songs prior to their afternoon nap in 1942. AP hide caption

itoggle caption AP

Francis Csedrik remembers details of being bonked hard on the head when he was 4, and having to go to the emergency room. Meg Vogel/NPR hide caption

itoggle caption Meg Vogel/NPR

Teacher Denise Severing leads a math lesson at a Head Start school in Woodbourne, New York. John Moore/Getty Images hide caption

itoggle caption John Moore/Getty Images