From their ranks have come the bold explorers, the iconoclasts, and the heretics of history. In support of his theory, Sulloway provides evidence that Darwin's revolutionary theory of evolution was more readily accepted by laterborns, and generally rejected by firstborns. Family dynamics is more than simply birth order, though. At least people aren't as mean to their siblings as that bird, the blue-footed boobie. Unless food is plentiful, the oldest chick pecks the younger one to death.
Research seems to support the importance of social interaction.
Adler himself had an erroneous memory of running across a cemetery, to overcome his fear of death. Sounds like exposure therapy.