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data-testid="list-page-header-element">Stories by Kristin Leutwyler</h1><div class="description-IBN8e" data-testid="list-page-header-element"></div></div><div class="articleList-R10iq root-fREBs"><div class="articleListGrid-N4wvY grid-PoVrj containerHideLastItemIfNativeLoads-PffoX"><article class="article-pFLe7 articleListItem-EDtwh item-NF5qX"><a class="articleLink-2OMNo" href="/article/tattersall-paleoanthropologist-ian-tattersall-talks-about-what-makes-humans-special-video/" data-testid="article-link"><figure class="articleFigure-Q7l9w" style="--ratio:var(--image-ratio, 56.25%)" category="Evolution"><img alt="Scientific American Logo" class="articleImg-Ls3LK" src="https://www.scientificamerican.com/static/sciam-mark.jpg?w=450" loading="eager"/></figure><div class="kickerContainer-U9kI5"><div class="kicker-EEaW-">Evolution<span class="kickerSpacer-I99oW"></span><span class="kickerMeta-0zV3t">September 1, 2014</span></div></div><h2 class="articleTitle-mtY5p"><p>Paleoanthropologist Ian 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