Science

Halley's Comet is predicted to appear again in which year?

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Mariner IV sent the first pictures of which planet back to earth?
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What does the first "A" in NASA stand for?
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If you're talking about electricity, what does "DC" stand for?
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In math, "pi" is equal to?
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What type of lens has a thin middle and makes objects appear smaller?
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Who was the last person to set foot on the moon in 1972?
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With 11,674 steps, where is the longest flight of stairs located?
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What cells store food in the roots?
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