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Arthur Caplan is the founding director of the Medical Ethics division of the Department of Population Health at the New York University School of Medicine. He has been involved in postmortem sperm retrieval cases for more than two decades.

As Esper left Washington on Saturday, US troops were continuing to pull out of northern Syria after Turkey's invasion into the border region. Reports of sporadic clashes continued between Turkish-backed fighters and the US-allied Syria Kurdish forces despite a five-day cease-fire agreement hammered out on Friday between US and Turkish leaders.

Areas of Zhejiang, Shanghai, Jiangsu, Gansu and Shaanxi will experience up to 300 mm of daily rainfall, while some of the aforementioned regions will see more than 70 mm of hourly precipitation, accompanied by thunderstorms and strong winds, the center said.

Around Australia, the debate over climate change and its impact on the environment is intensifying and polarizing the nation.