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Charlie talks about efforts to save Timbuktu's precious manuscripts from al-Qaeda in 2012-13, and examines the powerful myths that drew early European explorers there.

In 2014 Ben led the longest ever polar journey on foot, completing the South Pole return that defeated Scott and Shackleton. In 2017 he attempted the first solo, unsupported and unassisted crossing of Antarctica.

Hull's seafarers: Stephenson and Holness

Stephenson and Holness were the firemen on board the Endurance.