What did we learn about the polar bears? We learned that they live in the Arctic, can swim for seven days, and that the skin underneath their fur is black. How does the polar bear stay warm in the icy waters? We learned about insulation. Our scientists put one hand in a bag covered with fat and the other in a bag with no fat and placed them in ice water. Yes, indeed, the hand with the fat stayed warm, and the hand without was quickly very cold.