I get a kick out of this channel. His videos where he's a mathematician are best. Where he tries to be a popular presenter he loses his advantage I think. This one has to do with a relatively unknown kind of periodicity, with wide-ranging applicability, such as interaction between populations and ecosystems that show periodicity that is liable to be construed as the result of something external. Stick with it. Title: "This equation will change how you see the world"