Men have nipples because embryos are sexually neutral for their first six weeks. Here's the developmental blueprint behind ...

Many pregnancies face challenges before a woman even knows she is expecting. One reason is the embryo’s rapid growth; any disruption during this stage can affect development. During week 3, the embryo ...

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 ...

An international team of experts in embryology and bioethics has published the first white paper on the use of embryonic ...