Android 📱

The latest mobile phone isn't always the greatest. Despite a series of newer, updated Pixel 10 models, we still think the previous generation's Pixel 9a is more than enough phone for most people. Not only does it have great battery life and feature support, but it often goes on sale for well under $500. In this case, Best Buy has the 128-GB Pixel 9a discounted to just $399, and it's available in all four colors: Iris, Obsidian, Peony, and Porcelain.

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The latest Moto Watch is a remarkable step up. Motorola is one of the fastest-growing mobile companies in the world. Its phones are reasonably priced, have great battery life, and are easy and fun to use. Those characteristics haven’t necessarily crossed over to its watches, however. Last year, I tried the Moto Watch Fit. It was … OK. But $200 is way too much, and there’s no reason to buy a cheapish, Android-compatible watch when the Garmin Vivoactive 6 or the CMF Watch 3 Pro are sitting right there.

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After a prolonged slump, Apple’s business is suddenly thriving again in China. The tech giant said in its latest earnings report last week that revenue from the country rose 38 percent year over year in the last quarter, primarily driven by surging demand for iPhones. The rebound came after Apple’s China sales had declined for 18 consecutive months between 2024 and early 2025.

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Five years ago, mathematicians Dawei Chen and Quentin Gendron were trying to untangle a difficult area of algebraic geometry involving differentials, elements of calculus used to measure distance along curved surfaces. While working on one theorem, they ran into an unexpected roadblock: Their argument depended on a strange formula from number theory, but they were unable to solve or justify it. In the end, Chen and Gendron wrote a paper presenting their idea as a conjecture, rather than a theorem.

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