University of Maryland Biology Professor Daphne Soares' surprising discovery about blind cavefish is making news. Her research shows at least two species of amblyopsid cavefish are partially deaf, as well as blind. "The first hypothesis we had was that these fish that lost their sight should have an increase in hearing capabilities," Prof. Soares, a sensory neuroscientist, told Live Science. "It was a big surprise when we found they were a little deaf, and it took a while to come up with an understanding of what was happening." Can you guess what evolutionary advantage partial deafness may provide to these fish? Read Prof. Soares' hypothesis in this NBC News story.