Invisible to the Human Eye: Scientists Create the World’s Smallest QR Code

A 1.98-square-micrometer QR code, etched into ceramic thin film and verified by Guinness, showcases a new approach to ultra-dense, long-term data storage. How small can a QR code actually be? Researchers have now pushed the limits so far that the code can only be detected with an electron microscope. A team at TU Wien, working [...]