Human rights received far less mention on President Trump’s trip to the Middle East than is usual for past presidents.

Researchers have developed a new stem cell model of the mature human amniotic sac, which replicates development of the tissues supporting the embryo from two to four weeks after fertilization. This is ...

There were more than 48,000 organ transplants in the United States last year. They’re commonplace now, but the practice was considered experimental only a half-century ago.