Science

What is the opening of a lens, which controls the amount of light?

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Orange juice is a good source of which vitamin?
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What is Earth's nearest neighbor in space?
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In what year did Albert Einstein win the Nobel Prize for physics?
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What does one call a smaller stream that parallels a larger stream and finally enters the larger stream?
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How fast does light travel in one second?
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What is the irregular and instantaneous motion of air called?
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What protects our Earth from harmful rays?
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John Glenn was the first American to orbit the earth, in how long a flight?
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