This week series host Kate Humble takes the Rough Scientists away from their epic quest for New Zealand gold, and sets them one of the show's toughest challenges yet. The team must measure the speed and melt of the Franz Josef Glacier, an awesome seven miles of ice.

The Rough Scientists on the glacierIn addition, the scientists have to keep themselves warm on the ice without lighting any fires, which involves building an ice lens and generating chemical heat.

With just a basic toolkit and the island's natural resources at their disposal, the team must draw on their pooled ingenuity and scientific knowledge to complete the tasks.

"Rough Science" is the thinking person's reality show. The series takes a group of highly skilled scientists, drops them in a remote location and presents them with a series of challenges, all designed to test the practical side of their disciplines. In the engaging second season of the series, the tasks confronting the scientists revolve around a quest for gold in New Zealand and mastering space in the Arizona desert.

Note: This is part 4 of a series of 6 parts.