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Various shots of the margin of the Russell Glacier Shots on the Greenland Ice Sheet, including water running off Arctic Fox kits in the grass. Greenland Ice Sheet shots of melting Climate researcher Billy D'Andrea and colleagues explore the remote "back lakes" of Greenland. To understand how Earth’s climate system has changed over time, scientists need to find, develop and use natural recorders of temperature and precipitation. One natural thermometer comes in the form of alkenones: trans-fats produced by certain algae. Meet Dr. Ethan Brodsky from the U. of Wisconsin, who advised a group of undergraduate students in the design and build of an electric snowmobile. Video produced by Ice Stories correspondent Zoe Courville. For two days Summit Camp, Greenland experienced strong winds and blowing snow, making work, and even walking around camp, difficult. In this zany competition teachers have ten minutes to create a science activity from a special secret ingredient. This week: hair care products! The Mars Phoenix Lander will have been collecting data and sending it back to earth for a month! Exploratorium Senior Scientist Paul Doherty will examine the data and tell us what new information we've gained about Mars. We'll also get an update on our old friends, the Mars rovers Spirit and Opportunity!