FILE - In this Aug. 14, 2013, file photo, an in vitro fertilization embryologist works on a petri dish at a fertility clinic in London. Tens of thousands of people undergo in vitro fertilization every ...

During mammalian reproduction, millions of sperm undertake a journey that only one will finish. This journey to fertilization has been commonly viewed as a race: a sea of sperm competing to get to the ...

Researchers have captured the very first real-time, three-dimensional images and videos of a human embryo implanting into synthetic uterine tissue—revealing a key stage in reproduction. The resulting ...