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Category: Grade 4

How many kinds of cacti are there?

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What are some of the weirdest sports in the Olympics?

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What was the Ice Age like?

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Why are some people left-handed?

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How is plastic made?

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Why do we need blood?

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What’s the biggest tree in the world?

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Why is the ocean salty?

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Can trees talk to each other?

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How do optical illusions trick us?

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