Signal Ring just announced a $399 ring that reads blood pressure continuously with no cuff and no need to calibrate. A first — if it works. Prompted me to look at where we are with current efforts at BP on wearables from Huawei, Samsung, Hilo, and Apple. Bottom line: no cuff-less device has been validated for continuous use, including Signal Ring.

There's a number that predicts whether you'll be alive in ten years better than your blood pressure, your cholesterol, your BMI, or whether you smoke. The American Heart Association has been recommending it as a vital sign since 2016. Your doctor has almost certainly never measured it. Apple Watch measures it every time you take a brisk walk.

Current AI health tools share the same flaw as traditional healthcare: they're episodic, not continuous. OpenClaw — a nerdy new tool that’s shot to 2 million users in nothing flat — shows us what comes next: AI assistants that monitor your health 24/7, cross-reference data sources, and act on your behalf without being asked.