Another hurdle has emerged that must be overcome for long-term space habitation and the colonization of Mars. On the 26th ...

A new study found that microgravity simulated on Earth hindered sperm cell movement, egg fertilization and embryo development ...

The earliest days after fertilization, once a sperm cell meets an egg, are shrouded in scientific mystery. The process of how a humble single cell becomes an organism fascinates scientists across ...

Descriptions of the embryo go back at least to the time of Aristotle, but it has only been since the late 19 th century and early 20 th century that advances in experimental approaches allowed ...