Apple just brought blood oxygen tracking back to millions of Apple Watch Series 9, Series 10 and Ultra 2 models, missing since early 2024, when Apple removed it. Here’s what’s happened, how the new ...
Lindsey Ellefson is Lifehacker’s Features Editor. She currently covers study and productivity hacks, as well as household and digital decluttering, and oversees the freelancers on the sex and ...
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