Host Phil Keoghan ventures contained in the lively Masaya volcano in Nicaragua. Sal Masekela embeds with motorbike riders transporting photo voltaic panels to distant areas of Tanzania. Mariana van Zeller meets with an oil mogul whose horse cloning enterprise could present perception to remedy Type 1 diabetes. Gelareh Darabi travels from Hawaii to the Midwest to see how Americans are getting ready for a nuclear assault.

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