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Mending Ozone Hole May Worsen Climate Change

from Scientific American

Decades of chemical pollution have damaged the ozone layer of the upper atmosphere that shields Earth from the harmful effects of the sun's ultraviolet rays, each summer eating a hole over the South Pole that expands to nearly the size of Antarctica.

But since 1996, when an international treaty banned the culprit chemical refrigerants and propellants ... , the size of the seasonal tear has been shrinking - and scientists predict it may stop forming by the end of this century.

You would think that was good news. But atmospheric scientists caution in a new study published in Science that sewing up the rift in the ozone ... layer may exacerbate another environmental woe: climate change.

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PODCAST & VIDEO: 3D Printing Replacement Body Parts

Regenerative medicine, a fledgling field with the aim of regrowing parts from a person’s own cells, is being amplified with 3D-printing technology, which can now use organic materials to create scaffolds that cells need to grow into their final forms. Richard Wysk, a professor of industrial and systems engineering at North Carolina State University, discusses the latest successes with this research, and the timeline for creating more complicated structures.

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