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Read articles, including Science News stories written for ages 9-14, on the SNK website.
RUNNING HEEL

An MRI of a distance runner's foot and ankle shows a heel bone sized to pull the Achilles tendon taut, a condition that researchers say applied to Stone Age humans but not to Neandertals. Measurements of part of the heel bone (shown in red) helped scientists determine how easily an individual could run long distances. Credit: D. Raichlen

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