Education Bookcast

When we ask the question of whether something is "nature or nurture", we are implicitly suggesting a dichotomy, or excluded middle - it is either nature, or nurture, or a mix of both, but not a mix of both plus something else. In The Hidden Half, Michael Blastland takes us on a journey of skepticism which somehow magically reveals the presence not only of a "third factor", but shows, startlingly, that such a factor has been known to account for as much as half (!) of the variation in some traits. References to dark matter immediately spring to mind. After reflecting on a paradigm-shifting species of parthenogenic crayfish, the author discusses, among other things, how you only have a 50% chance of developing the same mental disorder as your identical twin you were raised with is already suffering from (shared genes and environment, remember - shouldn't this be close to 100%?); the mysterious inability to transfer infant mortality reduction measures to new regions; and the still inexplicable sudden drop in tee