<p>➀ Researchers at Waseda University developed a sweat sensor inspired by the hydrophilic/hydrophobic properties of rose petals to monitor electrolyte loss during exercise;</p><p>➁ The sensor uses ion-selective membranes with microtextured surfaces mimicking rose petals, enabling water retention, self-cleaning, and motion resilience without adhesives;</p><p>➂ A 3D-printed wearable prototype demonstrated accurate sodium monitoring in sweat during running tests, with a self-cleaning mechanism triggered by increased sweat volume.</p>