TODAY'S SCIENCE TRIVIA: Aside from a systemic heart that maintains circulation throughout its body, the common octopus also has two branchial hearts that move its hemolymph (the blue-tinted equivalent of blood in most invertebrates) beyond its gills.
Furthermore, two-thirds of an octopus’ neurons are found not in its head, but in its arms. This allows the appendages to perform complex reflex actions without direct input from the brain. In fact, experiments have shown that an octopus' severed arms can still react.
