PMDD isn't just "bad PMS", it's a condition that needs to be taken seriously. With expert advice, one writer opens up about her experience.

Accuracy is paramount for heart rate monitors. A reliable HRM provides consistent, precise heart rate readings during various ...

Seals give birth only when conditions are right. After mating, a female seal can delay implantation of the embryo in the ...

Although it also performs some functions in men, estrogen, the main female sex hormone, is involved in a myriad of processes, ...

What makes someone a "morning lark" or a "night owl?" Why does jet lag hit us so hard, and why do some people struggle each ...

Here's everything you need to know about the symptoms, signs and development stages of the third week of pregnancy, with ...