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  1. Tech

    Fiber Helper: Minuscule controllers may open data floodgates

    A device that fits on the end of optical fibers may make possible the next big boost in Internet speed without new underground cables.

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  2. Astronomy

    In the Beginning: Dark matter builds galaxies, feeds quasars

    Cosmologists say they have found compelling evidence that massive galaxies were already in place when the universe was less than a billion years old.

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  3. Paleontology

    Wings Aplenty: Dinosaur species had feathered hind limbs

    A team of Chinese paleontologists has discovered fossils of a small, feathered dinosaur that they say had four wings.

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  4. Earth

    Estrogens classified as carcinogens

    The sex hormones known as steroidal estrogens, which are used in hormone-replacement therapies and birth control pills, have joined a government list of known human carcinogens.