Most memories, if they do survive, come to adults with more clarity if they happened around or after age three-and-a-half. Still, not many that happen between three-and-a-half and puberty survive throughout life. Before we get into middle school most of the evocative impressions we may have held onto from toddlerhood to elementary school have vanished. As teens and adults, we are left with the stories we have heard about being little, along with incomplete fragments of events (if any at all). Only recently have scientists begun to understand the neurological underpinnings of this inevitable loss.