In this school of life, the most important learning takes place in the principal schoolhouse: the home. The textbooks are the objects around toddlers and the events that transpire as they make their way through each day. Parents and caregivers are the principal teachers. The majority of lessons occur via independent study. As toddlers look, listen, prod, poke, wave, clang, roll, tear, bang, pat, sniff, and mimic others, they learn. Field trips, including everything from walking down the block to accompanying parents on errands, enrich the curriculum by giving them glimpses of the greater world.