Science

In math, "pi" is equal to?

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Which scientist disproved the Spontaneous Generation Theory?
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Ice pellets are also known as what?
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What is the name for a tool that makes work easier to do?
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Which of the following books has Carl Sagan not authored?
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What is the main form of energy produced by a laser?
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Which branch of science did young Carl Sagan tell his grandfather he wanted to practice?
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In which year did the first space shuttle launch?
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What cells store food in the roots?
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