Under his microscope, Jun Wu could see several tiny spheres, each less than 1 millimetre wide. They looked just like human embryos: a dark cluster of cells surrounded by a cavity, and then another ...

Scientists are exploring ways to mimic the origins of human life without two fundamental components: sperm and egg. They are coaxing clusters of stem cells – programmable cells that can transform into ...

The little clump of cells looked almost like a human embryo. Created from stem cells, without eggs, sperm, or a womb, the embryo model had a yolk sac and a proto-placenta, resembling a state that real ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. It’s still one of ...

Scientists have grown an entity that closely resembles an early human embryo, without using sperm, eggs or a womb. The Weizmann Institute team say their "embryo model", made using stem cells, looks ...

Scientists have created the synthetic human embryos - using no eggs or sperm - provoking deep ethical questions, according to reports. The synthetic embryos - only days or weeks old - could help ...

Human cell models may never be as good as the real thing, but we need these models to be as close as possible to understand how diseases develop and progress, and whether treatments are effective.

In April 2025, the US Food and Drug Administration (FDA) announced a pivotal shift in drug development policy. The agency has set out to reduce, refine and potentially replace its long-standing ...