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Why Do Highways Have Mile Markers?
Today’s Wonder of the Day hits the road for a counting adventure!
Why Do Highways Have Mile Markers?
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How Do Automatic Doors Know When To Open?
Today’s Wonder of the Day opens with a “swoosh!”
How Do Automatic Doors Know When To Open?
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What Should You Do in Case of a Fire?
Today’s Wonder of the Day will help you be ready in case of an emergency!
What Should You Do in Case of a Fire?