Science

Who discovered the supernova and was the first to theorize that stars "die"?

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Which of these has a lens?
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What scientist is credited with developing the first vaccine?
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Which of these objects would be attracted to a magnet?
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Which of these is a virus that doesn't immediately cause damage to tissue?
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What is the square root of 625?
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Which parts of a flower are often brightly-colored and have many different shapes?
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One kilogram is equal to how many pounds?
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What are the first four planets in the solar system called?
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