<p>➀ A UCLA-developed 3D smart pen detects Parkinson's early with over 96% accuracy by analyzing handwriting movements using motion sensors and magnetic ink;</p><p>➁ The self-powered device converts motion into electrical signals via a magnetic silicone tip and requires no batteries, enabling use in low-resource settings;</p><p>➂ Early diagnosis is critical as current methods often miss early symptoms, and the pen offers an affordable, portable alternative for routine check-ups.</p>