The Yamnaya people, long associated with horses, are now the earliest known riders.Skeletons from around 3000 B.C.E., unearthed from burial mounds in Eastern Europe, show wear patterns consistent with horseman syndrome, providing the oldest direct evidence of humans on horseback.CHINA The Mamenchisaurus, a massive sauropod, may have once munched treetop leaves in what is now China thanks to its 50-foot neckpossibly the longest of any known animal.
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