Ember’s self-heating smart mug is more than $50 off ahead of Mother’s Day

Sales rebounded a bit from the first quarter of 2025, as Tesla throws a ton of money at massive bets like robotics, AI, and its own chip fab.

X is putting its AI chatbot, Grok, in charge of your timeline. In an announcement on Wednesday, X product head Nikita Bier says Premium subscribers on iOS can get early access to a feature that allows users to pin specific topics to their home tab, which Grok will then use to curate the posts you see across each feed. "It's powered by Grok's understanding of every post with the algorithm's personalization - meaning every timeline is made just for you," Bier writes. "And it works even better when

NASA's next eye into the cosmos is due to leave our planet later this year. The agency says it's targeting an early September launch for the Nancy Grace Roman Space Telescope. Roman (for short) has a field of view 100 times larger than Hubble's. The September date is the earliest possible launch for Roman. NASA says it will go up (aboard a SpaceX Falcon Heavy rocket) no later than May 2027. The Nancy Grace Roman Space Telescope, named after NASA's first chief astronomer and "mother" of Hubble, w

How Ars Technica uses, and doesn't use, generative AI.