The deeper you go below the surface, the darker it gets. So, how do animals communicate with each other if it's too dark for them to barely see each other? Past research has shown that some animals, such as whales and dolphins, communicate by emitting sound. Recently, scientists from Stanford University and the Monterey Bay Aquarium Research Institute (MBARI) made a fascinating discovery. Ben Burford (from Stanford) and Bruce Robison found that Humboldt squids -- which belong to the cephalopod family, communicate using bioluminescent organs. Bioluminescence is the ability of marine animals to...