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  1. 19498

    I wonder if the upsurge in alien, invasive species in real estate boom areas is, at least in part, because of careless gardening. Many people introduce non-native plants into their landscape without regard to the potential for domination of these pretty plants over native species. Carol SenskeGreen Lane, Pa.

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  2. Plants: Importance of being economic

    The pulse of the real estate market in a given area turns out to be a powerful indicator of how many exotic plant species have invaded the neighborhood.

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  3. Astronomy

    A dwarf with a disk

    The Hubble Space Telescope has examined in unprecedented detail a ring of debris around a star that could be the nearest and youngest known home for planets outside the solar system.