Question 1. Which astronomer, born in 1453, revolutionised astronomy with new theories about the movements of Earth's planets?
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Question 2. In 1903 the American brothers Orville and Wilbur Wright tested an invention that relied on an understanding of aerodynamics. What invention, using an internal combustion engine, did they test?
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Question 3. What very useful phenomenon, now used extensively as a diagnostic tool by physicians, was discovered accidentally by the German scientist William Roentgen?
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