In many scientific applications, we observe a system in different conditions in which its components may change, rather than in isolation.

The post-chatbot era has begun. Americans are living in parallel AI universes. For much of the country, AI has come to mean ChatGPT, Google's AI overviews, and the slop that now clogs social-media feeds. Meanwhile, tech hobbyists are becoming radicalized by bots that can work for hours on end, collapsing months of work into weeks, or weeks into an afternoon. Recently, more people have started to play around with tools such as Claude Code .

With excellent noise canceling, the QuietComfort Ultra 2 would love to join you on your next long-haul flight. Our favorite pair of wireless headphones for traveling are currently marked down by $50. You can pick up the Bose QuietComfort Ultra 2 from Amazon for just $399 in both Black and Driftwood Sand, with the other colors remaining at their full price. Bose is known for incredible active noise canceling, and the latest generation of QuietComfort over-ear headphones is no different. Our reviewer Ryan Waniata was extremely impressed with the Bose, despite only minor upgrades, and considers them among the top three headsets when it comes to ANC, rivaled only by Sony's WH-1000XM6 and Bose's first-generation QuietComfort Ultra .