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What is an LED?

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What was the name of the first artificial satellite launched into space?
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Where is the asteroid belt found?
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What spacecraft takes astronauts into space, orbits the Earth and can be flown more than once?
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What is water in its solid form called?
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What is the speed of sound called?
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Which insect is the closest relative to the grasshopper?
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In what year did Albert Einstein win the Nobel Prize for physics?
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