In this tumultuous election year one wonders whether reasoned debate about education or other policies is still possible. That said, research has a role to play in helping policymakers make good decisions – if not before than after they are in office. So what do we know about the ability of early education to change children’s lives? At the moment, scholars are divided. One camp argues that pre-k doesn’t work, suggesting that it would be a mistake to expand it. Another camp believes that it...