Science
What is matter that allows light to pass through called?
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How long, in kilometers, is the average single thread unwound from a silkworm cocoon?
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How do scientists refer to the direction from which the wind is blowing?
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What scientist is credited with developing the first vaccine?
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What type of cell doesn't have membrane around its nuclear material?
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What is the theory of the beginning of the universe called?
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Which of these is one of the three basic cloud forms?
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When cool or cold air suddenly drops to the ground, it is known as a what?
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How often does sunspot activity reach its lowest point?
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