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DNA Drugs Come of Age

After years of false starts, a new generation of DNA vaccines and medicines for HIV, influenza and other stubborn illnesses is now in clinical trials

By Matthew P. Morrow and David B. Weiner

Is the Universe Leaking Energy?

Total energy must be conserved. Every student of physics learns this fundamental law. The trouble is, it does not apply to the universe as a whole

By Tamara M. Davis


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