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  1. Paleontology

    Sahara yields second-largest dinosaur

    Excavations near an Egyptian oasis have unearthed the fossils of an animal that probably ranks as the second-most-massive dinosaur known.

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  2. Paleontology

    Fossil footprints could be monumental

    Trace fossils found in a vacant lot in a small town in Utah, including the footprints of meat-eating dinosaurs, could soon be protected as part of a new U.S. national monument.

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  3. Chemistry

    Hassium holds its place at the table

    Researchers have performed the first ever chemical studies on the element hassium.

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  4. Chemistry

    Chemists make hard-to-catch molecules

    Chemists have devised a new way to stabilize highly reactive molecules called carbenes.