A study by the University of Bergen, Norway, has revealed that comb jellies are far more complex and brain-like than we previously thought. The study used high-resolution scans of the creature's aboral organ (AO), which allows the jelly to orient itself in the ocean's depths by detecting gravity, changes in pressure, and the direction of light. The AO was made up of about 900 cells, with 17 different types of cell types, including ones that are new to science. This discovery could have implications for the evolution of animal nervous systems. The research was published in Science Advances.