The study itself: http://www.pnas.org/content/early/2015/10/29/1518393112.full.pdf http://www.pnas.org/content/early/2015/10/29/1518393112.full... Kudos to the

The study itself: http://www.pnas.org/content/early/2015/10/29/1518393112.full.pdf http://www.pnas.org/content/early/2015/10/29/1518393112.full... Kudos to the authors and journal for providing a full PDF immediately. Boo to the Washington Post for not linking.