1. Gems

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. 24 April 2018. 44 min

This program explains the formation, chemistry, variations and allure of the most notable gemstones; diamonds, emeralds, sapphires, rubies, jade and opals.

2. Metals

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. 24 April 2018. 44 min

Metals: What is it about the nature of metals that have made them a pillar of human civilization?

3. Power

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. 24 April 2018. 44 min

Power: Drill underground to see the treasures that power our world—today and into the future.