A new study with worms suggests one reason reproduction slows with age: a decline in the ability to repair broken DNA strands.
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Gun deaths in the US are reaching unprecedented levels. A new study digs into the data behind the violence.
A labor expert explains what’s at stake in the federal government’s intervention in a potential strike of rail workers.
Documentos internos muestran quejas del personal sobre el hecho de que sus pruebas con animales se están acelerando, causando sufrimiento y muertes innecesarias