Research index·Journal articleOne per centThe New Scientist·1 Jul 2011DOI10.1016/s0262-4079(11)61820-4Journal articleOne per centThe New Scientist · 2011 · SubscriptionDOI10.1016/s0262-4079(11)61820-4ReadRead at the publisherSaveCiteAdd to literature reviewPaywalledThe full text is at the publisherOpen it at the publisher to read it.Read at the publisherDiscussionAdd to the discussionTopicsBusinessRelated papersMoreDetailsPublished, publisher, issueSuggest a correction or report