In most ant colonies, there are different types—or castes—of ants: workers, drones and queens. Researchers have discovered that you can have two ant eggs with the exact same genes, and one can grow up to be a large queen that lives a long life laying eggs, while another becomes a smaller worker that only lives a few months. How is this possible? It turns out that not just nature, but also nurture, determines the future for larvae. Neuroscientist and evolutionary biologist Daniel Kronauer joins