Artificial intelligence: How do you know a human wrote this?

To appreciate the potential danger, it helps to understand how GPT-3 works. Language models often need to be trained for specific uses -- a customer-service bot used by a retailer might need to be fine-tuned with data about products, while a bot used by an airline would need to learn about flights. But GPT-3 doesn't need much extra training. Give GPT-3 a natural-language prompt -- "I hereby resign from Dunder-Mifflin" or "Dear John, I'm leaving you" -- and the software will fill in the rest with text that is eerily close to what a human would produce.