Ever wonder what’s going on with your blood? C’mon, yes, you have. Remember Ms. Frizzle? Don’t tell me she and her magic school bus didn’t spark at least some kind of interest in what’s going on inside your body.

Like maybe the oxygen content of your blood? You wouldn’t know it if you’ve been using an Apple Watch for the last 18 months in the US, as they’ve done without their blood oxygen monitoring feature for that entire time, thanks to a semi-convoluted assertion of a patent infringement.

As of a software update today, though, blood oxygen monitoring is returning to the Apple Watch Series 9, Series 10, and Ultra 2 models in the US through a software update.

Apple Watch Series 10 (opens in a new window)

the telltale heart (monitoring smart watch)

Back at the tail end of 2023, Apple

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