Science
What is a long balloon filled with helium generally called?
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Who was the first President of the "Planetary Society", an organization of amateur astronomers?
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What is the female reproductive cell of flowering plants?
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What are materials that come from the earth called?
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Which of the following people is not recognized as developing family therapy?
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If you are caught in a sudden heavy rainfall of a showery nature, you are caught in a what?
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