Tiny generators called nanogenerators will produce power. They will get energy from light or from movements around them: for example, blood moving around your body or sound moving through the air. In the future, we may print nanogenerators onto materials for making clothes. They may power the phones in our pockets, heat our clothes in cold weather, or change the colours of a favourite dress. Scientists have already invented the first nanogenerators: tiny solar cells. Most solar cells only use the light that people can see. Nano solar cells can also use a different kind of light called infrared light; hot things produce this light all the time, even in the dark. We already use nano solar cells for making thin solar panels, but they are still very new One day we may add them to liquids which we can put onto