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Sponsor: COSI Everyone knows Tyrannosaurus rex—but did you know these fierce predators started life as fluffy, gangly hatchlings? Or that they evolved from a family of mostly small, fast ...

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Gabrielle Phifer checks out T. rex: The Ultimate Predator at COSI, where you can get up close with life-sized models, interactive exhibits, and cutting-edge reconstructions of this prehistoric giant.