Why do things change when they’re frozen? Zoey risks ice cream brain freeze to find out - with a little help from her friends in the Arctic and a scientist who works at the North Pole. She finds out that some animals can survive being frozen, and that Inuit have invented ingenious strategies to help us humans survive in extreme cold.

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The Big Question: “Can I freeze myself and then come back to life?” MY GREAT CHALLENGE: To understand how blubber keeps animals warm, challengers put on gloves filled with lard and go “fishing” in a tub of ice water. IN THE FIELD: Zoey visits a sub-zero climate chamber where machines are tested for their endurance in the cold. (And of course, there may be a few snowballs thrown along the way.).