Science

When did Panama move from South America to North America?

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Which insect is the closest relative to the grasshopper?
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What was the first sound-recording device called?
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What is a return of the electron beam to the top of a television picture tube?
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Which scientific term is best defined as an electrically charged atom?
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What is the opening of a lens, which controls the amount of light?
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Who was the first man in space in 1961?
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How many tons of meteor dust fall to Earth every day?
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When a dog repeats a learned behavior and gets a reward, what process is shown?
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