Technologies like solar panels and LEDs require a cover material that repels water, dirt and oil while still letting plenty of light through. There is also interest in new flexible materials so these devices can be incorporated into a variety of creative applications like curtains, clothes, and paper. Researchers from the University of Pittsburgh's Swanson School of Engineering have created a flexible optical plastic that has all of those properties, finding inspiration in a surprising place: the shape of Enoki mushrooms.