Science

What does a ruler measure?

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Which man-made waterway is 100.76 miles long?
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Which planet is the impact crater named the "Caloris Basin" found?
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With 11,674 steps, where is the longest flight of stairs located?
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What pair of sensory organs are located near the front of an insect's head?
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The oldest living tree is 4,843 years old and can be found where?
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Who was the first person to use a telescope for astronomy?
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What is the unit of measure called clo for?
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What is the stalk of a stamen called?
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