What is the next number in this series: 11, 13, 17, 19, 23?

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Which empire gave the world the Pilsner?

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What ethologist told the story of Elsa the lioness in the book "Born Free"?

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The world-renowned St. Paul's Cathedral is in what European city?

The Kung San people live in what area of Africa?

How many oxygen atoms does a molecule of ozone have?

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On June 25, 1993, Kim Campbell became the first female prime minister of which G8 country?

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