Rough Science: With the team's time in New Zealand running out, Kate offers the team some extra gold to help them make their jewelery. But it's buried somewhere on a nearby mountainside - so the scientists will need cunning to work out exactly where. Meanwhile Kathy searches for gold on a beach, and the two Mikes work out how to extract the gold from rocks collected earlier in the series.

Starring:

Kate Humble

Genre:

Documentary