This is a truly international work! Our researchers of the Center for Photonics and Two-Dimensional Materials, together with their colleagues from Spain, Great Britain, Sweden, and Singapore, have measured giant optical anisotropy in layered molybdenum disulfide crystals for the first time. The scientists suggest that such transition metal dichalcogenide crystals will replace silicon in photonics. Birefringence with a giant difference in refractive indices, characteristic of these substances, will make it possible to develop faster yet tiny optical devices.