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Selfless Heroes: 50 People Who Risked Everything to Save Others

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The Horror Within: 50 Frightening Facts About the Human Body –...

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Strange & Unusual: 50 Facts About Uncommon Plant & Animal Diseases

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South America: 50 Surprising Facts About Its Past & Present

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Gold: 50 Surprising Facts About the Precious Metal

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50 Really Interesting Facts about NASA – Part 3

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50 Interesting Facts about Invasive Species

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50 Interesting Facts about Animal Motherhood

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50 Shocking Unusual Experiments Few Know About – Part 2

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