But new insights into language learning are coming from an unlikely source: artificial intelligence. A new breed of large AI language models can write newspaper articles, poetry and computer code and answer questions truthfully after being exposed to vast amounts of language input. And even more astonishingly, they all do it without the help of grammar. Even if their choice of words is sometimes strange, nonsensical or contains racist, sexist, and other harmful biases, one thing is very clear: The overwhelming majority of the output of these AI language models is grammatically correct. And yet, there are no grammar templates or rules hardwired into them--they rely on linguistic experience alone, messy as it may be.