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4 | Why is thunder so loud? 2020-12-15 |
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5 | What is an echo? 2020-12-08 |
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6 | What did the Big Bang sound like? 2020-12-01 |
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7 | What happens to our food? 2020-11-24 |
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9 | How do bees talk to each other? 2020-11-10 |
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10 | What are birds saying? 2020-11-03 |
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