Graduate student Ben Hills, who is from Helena, Montana, operates a geo-radar system on the Greenland ice sheet. The radar system reveals the structure of the ice below the surface. Ben is searching for small crevasses that are a few meters deep, but do not intersect the surface. The crevasses were confirmed by drilling boreholes and lowering down a small video camera. Ben is interested in the crevasses because they sometimes fill with melt water. The water eventually freezes and releases latent heat that warms the surrounding ice. Ben’s graduate thesis project is focused on modeling energy exchanges at the surface boundary of the ice sheet. He has been asked to give a formal talk about his research this month at an international meeting of scientists in San Francisco.