David Frum, reviewing Mark Steyn's book, makes a great point that's been weirdly ignored during the contemporary fad over demographic fear-mongering: "Demographic trends have a surprising way of reversing themselves with amazing rapidity. Nobody foresaw the baby boom in 1938. And yet only eight years later, birth rates surged all through the developed world, in devastated Germany and Japan as well as in victorious Britain and America. OK, there was a big war in between. But s late as 1966, most forecasters thought the baby boom would continue indefinitely."