Introduce your class to the Everest expedition to reenact a 1924 climb by George Mallory and Andrew Irvine. Discuss and show pictures of the types of clothing worn at that time and compare it to today's state-of-the-art climbing gear. Then, turn them loose to test which types of fabric keep water from freezing the longest. High-quality handouts that boast color photographs as well as the stimulating topic of climbing Mount Everest increase the appeal of this classic experiment in heat transfer and insulation.