In the Middle Ages, women who wanted a boy baby were advised to avoid copulation during the dark of the moon and (while an abbot prayed) to drink wine, mixed by an alchemist, with lion’s blood. As ...

With embryolike constructs built entirely from stem cells, researchers can revolutionize our understanding of development. But how close to an embryo is too close? In April, researchers in China ...

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 ...