Do humans still need such big brains? Sure, parts of our cranial gloop continue to do useful work, like instructing our lungs to expand and contract, jaws to chew, fingers to swipe on touch screens. But everything beyond that basic stuff, it seems, could now be outsourced to AI. Students are already using the tech to glide through high school and college, getting chatbots to write papers that would once have exercised their developing gray matter (see Technology, p.20). Grooms, best men, and maids of honor are turning to AI to craft wedding speeches that previously would have required them to search through their mental catalog of memories for poignant and funny personal tales. Tech companies are laying off software engineers, the professional class that once defined brainwork, and…