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Rolling over, crawling, standing up, walking, the first tooth, reading, riding a bike… kids might not remember the first time they did each of these things, but their parents sure do! We call important life events like these "milestones.", Today in Wonderopolis we're celebrating a milestone of our own. We turn 100 today! Join us for our 100th Wonder of the Day, as we take a closer look at milestones.
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