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Gene Therapy's Second Act

A decade and a half after a series of tragic setbacks led to critical reevaluations, scientists say gene therapy is ready to enter the clinic

By Ricki Lewis

The Oldest Rocks on Earth

One team of scientists thinks ancient rocks discovered in northern Canada give us a window onto the planet's infancy and the birth of life itself. Another team thinks they're not that special

By Carl Zimmer


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Know Before You Vote