Why is, “What do you want to be when you grow up?” the go-to small talk we make with children? “Hello, child. As I have run out of compliments to pay you on your doodling, can you tell me what sort of niche you plan to carve out for yourself in the howling existential morass of uncertainty known as the future? Also, has anyone given you a heads-up that everyone you love will die someday?”