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Dan talks to Albert Lin, who has been using LIDAR technology to reveal tens of thousands of new Mayan structures in Guatemala.
On the 100th anniversary, Gervase Philips tells the story of the Battle of Amiens of 1918.
Lewis Dartnell explains the important role geology has played in human history.
Lipika Pelham talks to Dan about the Dutch Jewish community in Amsterdam, how the Sephardim Jews ended up there and what they endured during the Nazi occupation of the Netherlands.