Science
What is Neptune's period of revolution around the Sun?
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What is the world's largest non-profit, scientific and educational organization?
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What part of a plant obtains food and water from the soil and provides support?
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What type of circulatory system pumps blood into cavities instead of through vessels?
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Which Apollo mission was launched on April 11, 1970?
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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 a long balloon filled with helium generally called?
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What famous scientist introduced the concept of "space-time"?
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