What does evolution by natural selection mean? How does ​‘survival of the fittest’ explain the transformation of male clownfish into females? Or the many non-combative, non-competitive, and seemingly friendly interactions observed between ants and plants? Does it provide clues to the identity of the mysterious descendants of dinosaurs in today’s world? These are some of the questions we explore in our theme section ​‘Evolution revisited’. In Annals of History, relive unsung surprises in the process of discovery of penicillin with interactive resources designed for the science classroom. How do we use pendulums to illustrate fundamental concepts in mechanics? How do we recognize and clarify incorrect student conceptions of the science of everyday phenomena? Find out with the detachable activity sheets & concept builders in ​‘The Science Lab’.