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  1. Freon: Destroying the ozone layer?

    Scientists discovered in the 1970s that chlorofluorocarbons such as Freon were hurting Earth’s ozone layer.

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  2. Genetics

    Flexible DNA computer finds square roots

    Scientists design a digital circuit made of molecules that may be able to crunch a wider variety of complex math problems than previous versions.

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  3. Health & Medicine

    Body & Brain

    No link between viral suspect and chronic fatigue, plus reading minds, colored glasses for migraines and more in this week’s news.

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  4. Life

    Holding back evolution

    Gene mutations that are beneficial on their own combine to slow down progress, new bacterial experiments show.