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Why Do Credit Cards Now Have Chips?
Today’s Wonder of the Day is a chip off the old block!
Why Do Credit Cards Now Have Chips?
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How Many Bridges Cross the Amazon River?
If you’re coming to Wonderopolis today, you’d better bring a boat!
How Many Bridges Cross the Amazon River?
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Why Are Cats’ Tongues Rough?
Today’s Wonder of the Day is really the cat’s meow!
Why Are Cats’ Tongues Rough?