James Flynn: Why our IQ levels are higher than our grandparents

In 1900, only 3 of Americans practiced professions that were deemed cognitively Today, 35 of us do, and we have all learned to be flexible in the way that we think about problems. In this fascinating and fastpaced spin through the cognitive history of the 20th century, moral philosopher James Flynn makes the case that changes in the way we think have had surprising (and not always positive) consequences. TEDTalks is a daily video podcast of the best talks and performances from the TED Confe