On average, Neda Ulaby of NPR writes, someone in the world buys a copy of Eric Carle’s The Very Hungry Caterpillar every 30 seconds. The classic picture book, first published in 1969 and since then translated into more than 62 languages, turned 50 yesterday. Asked about its appeal earlier this year, Carle said, “I think it is a book of hope. Children need hope. You, little insignificant caterpillar, can grow up into a beautiful butterfly and fly into the world with your talent. Will I ever be able to do that? Yes, you will. I think that is the appeal of that book.” We’re not crying, you’re crying…