Josie Ford Feedback is New Scientist’s popular sideways look at the latest science and technology news. You can submit items you believe may amuse readers to Feedback by emailing [email protected] Doubling up If the internet is to be believed (it’s not), a growing proportion of celebrities have been replaced by clones. The latest to allegedly have their body snatched is actor Jim Carrey, star of Ace Ventura: Pet Detective and other cinematic miracles. Carrey attended the 51st César Awards in Paris on 26 February, his first public appearance for some time, and he looked a bit different compared with before. One might think that this would be attributed to some combination of ageing and cosmetic procedures, but instead, a conspiracy theory formed that the person wasn’t Carrey, but a clone.…