Stephen Hawking made his most famous scientific contributions studying what?
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Which ancient Greek scholar calculated the size of the Earth with surprising accuracy around 240 BC?
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Antoine Lavoisier identified which gas as essential to burning and breathing?
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What is the name for Alfred Wegener's theory that Earth's continents were once joined together and slowly drifted apart?
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Ernest Rutherford is credited with discovering the center of the atom known as what?
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Carl Sagan brought science to millions through which famous television series?
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Which mathematician developed calculus at the same time as Isaac Newton, sparking a famous feud?
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Johannes Kepler discovered that planets move around the Sun in what shape of path?
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Galileo Galilei improved the telescope and used it to study what?
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Which English physician first correctly described how blood circulates through the body?
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