The Download: AI puzzles and a path to our nearest star system

Plus: OpenAI is restricting its next model after rating it a "critical" cyber risk. Can you fare any better? Puzzles and games have always been central to AI development. The term "machine learning" was popularized in a 1959 article about an algorithm that learned to play checkers. Chess and Go are famous AI test beds too. Judged purely on its puzzling skills, AI is improving a lot--and quickly.