this green water, however, is infused with a special kind of algae that keeps things moist for longer, reducing the amount of water needed in the first place and also providing nutrients to help the plants grow. water's amazing, but of course, we shouldn't take it for granted. we are overfishing our seas, so here's an idea to try and prevent that. different fish are apparently attracted to different coloured lights, and this led fishing net uses this fact to target certain types of fish whilst repelling unwanted species. maker's safety nets say its tech could reduce unintended catches by up to 90%. meanwhile, over at the german pavilion, researchers from the fraunhofer institute have been looking at water for a different reason. one of the problems with renewable energy, like wind or solar, is how do you store it so you can use it when you need it, which might