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A new analysis of what were initially thought to be microbial fossils in Greenland suggests they might instead just be mineral structures created when ancient tectonic forces squeezed stone. While most of the structures point in one direction, the red arrow shows that some point in the other direction. Courtesy of Abigail Allwood hide caption

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Courtesy of Abigail Allwood

Geologists Question 'Evidence Of Ancient Life' In 3.7 Billion-Year-Old Rocks

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The hyolith Haplophrentis extends the tentacles of its feeding organ (lophophore) from between its shells. The paired spines, or "helens," are propping the animal up off the ocean floor. Danielle Dufault/(C) Royal Ontario Museum hide caption

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Danielle Dufault/(C) Royal Ontario Museum

A new species of ground beetle found in Antarctica (left) is named Antarctotrechus balli. The three other beetles are close modern relatives of the ancient species. The line drawings show similarities between the beetles. Courtesy of Allan Ashworth/North Dakota State University hide caption

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Courtesy of Allan Ashworth/North Dakota State University

Scientists using a high-resolution X-ray technique found that this bone belonging to a hominin, an ancient, extinct relative of modern humans, has a malignant tumor. Patrick Randolph-Quinney (UCLan) hide caption

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Patrick Randolph-Quinney (UCLan)

The most recent common ancestor of all today's snakes likely lived 120 million years ago. Scientists believe it used needle-like hooked teeth to grab rodent-like creatures that it then swallowed whole. Julius Csotonyi/BMC Evolutionary Biology hide caption

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Julius Csotonyi/BMC Evolutionary Biology

Earth's First Snake Likely Evolved On Land, Not In Water

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