For much of the last century, people had good reason to wonder whether it made sense to have babies. Millions of young men had died or been maimed in the trenches, and then along came the risk of being pulverised by an atom bomb. Nonetheless, men and women continued to have children and after both world wars there was a baby boom. As C.S. Lewis wrote in 1948: ‘It is perfectly ridiculous, to go about whimpering and drawing long faces because the scientists have added one more chance of painful and premature death to a world which already bristled with such chances.’ Somehow, we have lost this perspective. Back then, in the 20th century, schools taught young people to keep calm and carry on. Now, we’re teaching them to panic.