Advance In Human Embryo Research Rekindles Ethical Debate

Scientists have been able to make and study human embryos in their labs for decades. But they have never been able to keep them alive outside a woman's womb for more than about a week.

That limitation meant scientists were unable to conduct a range of detailed research into early human development.

 But now researchers say they have discovered a way to keep human embryos alive in the laboratory about a week longer than ever before, and through a critical period of development.
http://www.npr.org/sections/health-shots/2016/05/04/476539552/advance-in-human-embryo-research-rekindles-ethical-debate?sc=tw