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  1. Chemistry

    Solar Hydrogen

    With the vision of a hydrogen economy looming ever larger in people's minds, scientists have picked up the pace of their pursuit of materials that use solar energy to split water and make clean-burning hydrogen fuel.

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  2. Math

    Squaring Circles

    Cutting a circle into pieces and reassembling the fragments to form a square is a tricky proposition.

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  3. 19473

    In this article you wondered, “Should gene enhancement, or doping, be permissible for athletes attempting to improve their performance?” Sure, but in separate competitions. Athletes would register as either “doped” or “clean.” The problem with doping is not the doping, it’s the cheating.