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10 interesting human heart facts for kids

Children participate in a running activity during the European Athletics Health And Well-Being meeting on the Marseille's Vieux Port, on January 25, 2014 in Marseille, France.
Children participate in a running activity during the European Athletics Health And Well-Being meeting on the Marseille's Vieux Port, on January 25, 2014 in Marseille, France.
Photo by Alexander Roth-Grisard/Getty Images
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