Science
How long, in kilometers, is the average single thread unwound from a silkworm cocoon?
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What is the name for a tool that makes work easier to do?
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What is a steep-sided circular depression commonly known as?
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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 term given to heat and light radiated from the sun?
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In what year did Albert Einstein win the Nobel Prize for physics?
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What is the process by which pollen is transferred from the anther to the stigma?
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