A mantis shrimp shows its dazzling colors. Klaus Stiefel/Flickr hide caption

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Klaus Stiefel/Flickr

Episode 779: Shrimp Fight Club

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President Trump attends the opening of the Global Center for Combating Extremist Ideology, poses with the Saudi and Egyptian leaders, and touches a glowing orb during his May 2017 visit to Saudi Arabia. Saudi Press Agency/AP hide caption

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Saudi Press Agency/AP
Marianne McCune/NPR

Episode 775: The Pigweed Killer

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Simon Tam of The Slants. Ariel Zambelich/NPR hide caption

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Ariel Zambelich/NPR

Episode 774: Unspeakable Trademark

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Slot Machines at Caesar's Palace Lake Tahoe. Nik Wheeler/Getty Images hide caption

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Nik Wheeler/Getty Images

Episode 773: Slot Flaw Scofflaws

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Technology changes. Giordano Poloni/Getty Images/Ikon Images hide caption

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Giordano Poloni/Getty Images/Ikon Images

Episode 772: Small Change

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People line up outside a bank to exchange old currency notes with new ones on November 10, 2016 in New Delhi India. Shams Qari/Barcroft Media via Getty Images hide caption

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Shams Qari/Barcroft Media via Getty Images

Episode 771: When India's Cash Disappeared, Part Two

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Anil Bokil, a mechanical engineer by training, had a plan for demonetization. He presented it to now Prime Minister Narendra Modi in 2013. Chhavi Sachdev /NPR hide caption

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Chhavi Sachdev /NPR

Episode 770: When India's Cash Disappeared, Part One

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