In 2011, there were 3 known cases around the world of twins coming from different fathers.
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In their early careers, Sylvester Stallone and Jackie Chan both took part in porn.
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According to a study by the National Science Foundation, only half of Americans believe in evolution, and one in 4 don't know that the Earth orbits the Sun.
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Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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