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Which scientist developed his theories of black holes in the 1970s?

Stephen Hawking Stephen Jay Gould Donald Johanson Georges Kohler

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What did Walt Disney die of?

Coronary Artery Disease Heart attack Tuberculosis Lung cancer

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Erin reads an average of 20 books per year. She read 23, 17, 20, and 19 books in four different years. How many books did Erin read in the 5th year to make it an average of exactly 20.0 per year?

17 20 21 19