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.