This is a summary of: Govind, B. et al . Ultra-compact quasi-true time delay for boosting wireless channel capacity. Nature627 , 88–94 (2024). The problem . To transmit a complex image containing combinations of signals of different wavelengths (similar to colours of light), the beams of radio waves that facilitate communication between mobile devices need to arrive at the same time, undistorted. If signal components of different wavelengths experience different delays, they ...