HHS Secretary told members of Congress on Tuesday that wearables are "a way of people can take control over their own health." Have you ever noticed how a spilled cup of coffee leaves behind a telltale brown ring? While those stains might be annoying, the science behind them, known as the coffee ring effect, has sparked innovations in health technology. UC Berkeley researchers recently turned this everyday phenomenon into a breakthrough medical test, making rapid and reliable disease detection as easy as brewing your morning coffee. Curious how a simple coffee stain could inspire cutting-edge diagnostics and revolutionize at-home testing?