Science
What tool uses a magnetic needle that points north?
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Who was the first President of the "Planetary Society", an organization of amateur astronomers?
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A very fast white water cascade is also known as what?
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Which scientific term is defined as the rate at which a wave oscillates in cycles?
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What is the art of growing a miniature tree or trees in a low-sided pot or tray?
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Which of these is a unit of length used in marine navigation?
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