In 2004 in northern England, a husband and wife team of former Nazi codebreakers believed they'd cracked a centuries-old mystery. Shepherd's Monument in Staffordshire had long perplexed visitors, as it contains an inscription of random letters with no obvious meaning. Had the couple finally provided an answer? Is the code a love letter, a key to treasure, or something more?

Parcasters - When Darwin published his thesis on human evolution, it was highly contentious. When John Scopes introduced the theory into his lesson plan, criminal charges were brought against him. Learn about this historic trial on our other podcast NOT GUILTY.

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