Geologist and palaeontologist Donald R. Prothero is a busy man. Next to writing a steady stream of books on geology, fossils, and evolution, he is a noted sceptic. Previous books have addressed cryptozoology, UFOs and aliens, and science denial more generally. In Weird Earth, Prothero debunks conspiracy theories and pseudoscience relating to our planet, making for an entertaining slaying of geological fringe ideas. However, his aim is not merely to demean, but also to show readers what the actual evidence is and how we gather it. If the idea of a flat earth strikes you as unbelievable, buckle up, because it gets much weirder.