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1)
Did it all start with a snowball fight?: and other questions about the American Revolution
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2)
What sank the world's biggest ship?: and other questions about the RMS Titanic
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3)
Why did the whole world go to war?: and other questions about World War II
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8)
How many planets circle the sun?: and other questions about... our solar system
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12)
Which way to freedom?: and other questions about the Underground Railroad
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20)
Where do garbage trucks go?: and other questions about ... trash and recycling
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