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Exploratorium staff scientist, Dr. Paul Doherty, talks about his photos of Antarctica. In this special "holiday" edition of Iron Science Teacher, Paul Doherty joins our competition in the webcast studio live from Antarctica. Watch as the best teachers on the planet battle it out for the title of Iron Science Teacher. In this zany competition teachers will have ten minutes to create a science activity. This week's "secret" ingredient: ice! Nine Aim High students explore shadow and light, and build their own energy machines. In this webcast, the students delve into energy transference and alternative energy sources like solar cells and wind power. Watch as Exploratorium staff and local teachers compete for the title of Iron Science Teacher. Today's secret ingredient-dry ice!