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  1. 19037

    The new technology sounds great, but I am concerned about the food wrap described, given that my husband, among others, is acutely allergic to shellfish. If Yasa-sheet is, indeed, made from a crab-shell derivative, won’t it cause an allergic reaction? Lee DaneRidge Spring, S.C.

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  2. Materials Science

    Layered Approach

    A decade-old method for creating thin coatings is poised to move from the lab to countless low- and high-tech products.

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  3. Plants

    Emergency Gardening

    High-tech tissue culture is helping some ultrarare plants finally have sprouts of their own.

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  4. 18895

    As a plodder without the turbo gene I can appreciate those fortunate enough to have it.