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Breaking technology news for readers in the United States, filed the day it happens. We cover Apple, Google, Microsoft and Nvidia alongside the security breaches, privacy rulings and antitrust cases that decide what your devices are allowed to do, and every story is checked against primary sources before it runs. Model releases and app news sit in AI & Software, handsets in Mobile.

A team at Singapore’s Centre for Quantum Technologies has measured a lutetium ion clock to an uncertainty of one part in ten billion billion, the lowest ever reported for an optical atomic clock. Two of their clocks then agreed with each other more precisely than any clock comparison in history. The reason this matters is not the record. It is that the second itself is up for redefinition.

NASA’s Goddard Instrument Field Team spent part of the summer hiking tidal cliffs in the north-west Scottish Highlands with instruments on their backs. The reason is a set of grey-green spots in Martian rock that could be the residue of ancient life, or could be ordinary chemistry. The rocks at Stoer are 1.2 billion years old and they contain the same spots, which makes them the control group.