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How many years are in a sunspot cycle?
Science
How many years are in a sunspot cycle?
1
12
4
22
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Who invented the most common bacterial medium?
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How many astronauts walked on the moon before 1970?
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Deep trenches such as the Grand Canyon were formed by what process?
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Dolly was the first ever living creature to be cloned. What type of animal was she?
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John Glenn was the first American to orbit the earth, in how long a flight?
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How many Skylab Missions went up in space?
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What is matter that doesn't allow light to pass through called?
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