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P.PLAILLY/E.DAYNES/SCIEN​CE PHOTO LIBRARY IT ISN’T often that an esteemed professor sets out to investigate a scientific discovery made by a…

WASHINGTON — Scientists have uncovered a clue about why it takes so long for Huntington’s disease to develop. And they…

4/4 © Reuters. Spain’s acting Prime Minister Pedro Sanchez smiles after signing an agreement with Andoni Ortuzar, the president of…