Just a few decades ago, humans were the only species believed to be smart enough to grasp the concept of zero — the idea that nothing can be counted as something. While a select group of animals, including dolphins, primates, and a few birds, have since been added to the list, experts have always maintained that only “intelligent” species are capable of processing the difficult concept. Now, researchers from Melbourne’s RMIT University and France’s Université de Toulouse assert that honeybees, which like all insects are considered to be at the low end of the cognitive spectrum, also understand the abstract mathematical notion of nothing.