Last year was Earth’s third hottest globally, but temperature is just one measure of climate change’s influence.

© Philip Cheung for The New York Times

They drew with crayons, possibly fed on maggots and maybe even kissed us: Forty millenniums later, our ancient human cousins continued to make news.

Here’s a cheat sheet for decoding this year’s A.I.-driven tech lingo, from RAG to superintelligence.

© Sisi Yu