Windows! they let us look out on the world from our room and see all sorts of stuff. But could windows do more? Researchers have used nanotechnology to create efficient solar collectors which can collect energy from the sun. They make tiny silicon nanoparticles that are only a few nanometers in size and consists of less than 2000 atoms of silicon. At that size they are not only efficient at collecting solar energy but also don’t impact the ability to see through the windows. Most houses have lots of windows so why not use them not just to look out on the world but generate a bit of energy at the same time.