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  1. Planetary Science

    Planetary Beginnings: Data reveal Earth’s quick gestation

    Two new studies confirm that Earth's core formed in a hurry—during the first 30 million years after the solar system's birth.

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  2. Chemistry

    Down to the bone

    A new method for making bone cement could simplify hip and knee replacements and improve the surgeries' outcomes.

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  3. 19111

    Regarding this article, I was shocked. Not by the findings but the resources that were wasted. I have been involved in the radiation sterilization of medical devices for 30 years. Yellowing and brittleness of cellulose materials is well known, as are discoloration and damage to many plastics. Computer chips, CDs, film, and video and audiotapes […]

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  4. Materials Science

    What the mail must go through

    Mail irradiation in Washington, D.C.