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  1. Readers ask about Cuvier’s beaked whales, microbes in the atmosphere and more

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  2. Health & Medicine

    A new polio vaccine joins the fight to vanquish the paralyzing disease

    Work on the ground to vaccinate children continues in the push to finally eradicate polio.

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  3. Science & Society

    ‘The Light Ages’ illuminates the science of the so-called Dark Ages

    In telling the story of a monk who contributed to astronomy, a new book shows that science didn’t take a break during the Middle Ages.

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  4. Chemistry

    This weird chemical bond acts like a mash-up of hydrogen and covalent bonds

    Chemistry students are taught that hydrogen bonds and covalent bonds are distinct, but a new study shows they exist on a continuum.