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		<title>El sencillo truco de Carl Sagan que desmonta el terraplanismo en cuestión de segundos con dos palos y una cartulina</title>
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		<title>Carl Sagan y el cálculo de Eratóstenes</title>
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		<title>Cómo medir el perímetro de la Tierra con un palo</title>
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		<pubDate>Thu, 22 Jun 2017 18:10:02 +0000</pubDate>
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