How a sperm and an egg fuse together has long been a mystery. New research by scientists in Austria provides tantalizing clues, showing fertilization works like a lock and key across the animal ...

Egg fertilization is often described as an epic swim meet: Millions of sperm swim as fast as they can toward the egg until one — the fastest, strongest, healthiest sperm of them all — wins the race ...

Paterna Biosciences says it has grown human sperm from testicular tissue in a lab and used it to fertilize eggs, marking a first in reproductive science. The breakthrough could address a major gap in ...