Most Americans reject young-earth creationism. But the share of Republicans who believe that humans evolved fell from 54% in 2009 to 43% last year. Democrats, do not look so smug: your lot are likelier to believe in UFOs, ghosts and astrology. Also, that the moon landings were faked, that the CIA introduced crack to inner cities and that America’s government conspired in the September 11th attacks. It’s enough to make an ape weep.