Scientists at King’s College London developed a nanoneedle patch embedded with tens of millions of microscopic needles that collect molecular data from living tissues without causing pain or damage. This technology enables repeatable, minimally invasive biopsies, facilitating real-time monitoring of diseases such as brain cancer and Alzheimer's. The porous silicon nanoneedles, significantly thinner than human hair, extract proteins, lipids, and mRNA, providing a dynamic biochemical map of tissue health. Unlike traditional biopsies that are limited by invasiveness, this device promises to revolutionize clinical diagnostics and personalized medicine.