In our not too distant past, we grew up in families with many children, in communities with many children, with the older supervising, teaching, supporting, the younger. In the neighborhood of my childhood perhaps 50 kids, in a 12-year-or-so age spread, played together. When I lived in Fort Greene, Brooklyn, I would look down from my third floor window on South Oxford Street, and see the youngest kids playing on the sidewalks, protected from traffic by the parked cars, and watched by the young teenagers - who played in the street, and the older teens who watched from their gathering spots on the stoops of the block.But now, if I suggest that younger children should learn from and with older children, many parents - especially American parents - re-coil in fear. They expect, well, they expect all kinds of corruption, which is part of our belief in adolescents, and even "almost adolescents," as dangerous aliens.