Light can pass straight through transparent close transparentA material, object or substance which allows light to pass through it so that an image can be clearly seen through it. materials.

Train window using UMU. When the train passes near residential areas, the window automatically becomes opaque, protecting the privacy of those living near the tracks. A Japanese company is continuing ...

While glass bricks are effective for allowing daylight into buildings, they're not good insulators and they can't be used for entire load-bearing walls. Such is reportedly not the case, however, with ...