When it comes to design, Mother Nature is hard to beat and as they say, if you can't beat them, join them. We meet a group of scientists using the bioluminescent properties of a species of algae to provide emission and cost-free power—we join them as they try to light up Paris, the City of Light. We then meet a scientist using the swarm behavior of bees, ants and birds to help devise treatments for cancer, using nanoparticles to launch attacks on tumours inside the body.