To understand how pregnancy is possible during a period, you must know how the menstrual cycle works. The cycle typically lasts 28 to 32 days, although it can vary slightly. It is divided into four ...

COLUMBIA, Mo. -- Scientists have struggled to fully understand how male sperm cells function and why they sometimes fail to fertilize female eggs, which has implications for both livestock farmers ...

There are many potential causes of infertility, and it can be challenging to pin down just what the problem is when a couple is having trouble getting pregnant. Now, researchers show that a few key ...

Scientists warn that storage may cause sperm to lose quality over time, raising new concerns about fertility and conception ...