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    Nuclear Bunker Buster Bombs

    New burrowing nuclear weapons could destroy subterranean military facilities--but their strategic and tactical utility is questionable

    By Michael Levi

    Electrodynamic Tethers in Space

    By exploiting fundamental physical laws, tethers may provide low-cost electrical power, drag, thrust, and artificial gravity for spaceflight

    By Enrico Lorenzini and Juan Sanmartín

    Next Stretch for Plastic Electronics

    Organic semiconductor devices can make more than just bendable displays. They will find use in wearable electronics, chemical sensors, skin for robots and innumerable other applications

    By Graham P. Collins

    Arsenic Crisis in Bangladesh

    Arsenic in drinking water could severely poison 50 million people worldwide. Strategies being tested in Bangladesh might help prevent the problem

    By A. Mushtaque R. Chowdhury

    Back to the Future of Cereals

    Genomic studies of the world's major grain crops, together with a technology called marker-assisted breeding, could yield a new green revolution

    By Stephen A. Goff and John M. Salmeron

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