Think of draining pasta in a colander: pasta stays, water passes through. That's how membranes work. They filter out something while other stuff passes through. I work with membranes shaped like drinking straws used to purify drinking water or to filter the blood of people with kidney failure. Their walls act like a colander: filtering something out, while other stuff passes. Currently, we make these hollow fibre membranes in a single step out of one material. But one material isn't always enough: some pollutants slip through, or the artificial membrane structures causes blood to clot, requiring medicine to keep the blood flowing. That's why I research how to combine materials in a single step, to create tubes with specialised layers, so that one layer could trap tiny water pollutants, while another could mimic the surface of blood vessels to reduce medication for patients with kidney failure. By combining properties, we can create super membranes.