Local natural history group Rhayader by Nature is delighted to present a talk by a leading international palaeontologist this ...

Although many methods allow for period-like bleeding, it isn’t necessary. In some cases, bleeding may slow or stop entirely. True menstruation occurs after ovulation when the ovary releases an ...

Implantation bleeding is rust-colored, light spotting. By comparison, your period is a steady, light to heavy flow of bright to dark red blood. Implantation bleeding occurs when you’re pregnant, while ...

Ediacaran; Ꞓ, Cambrian; O, Ordovician; CI, confidence interval ... The 'boring billion' refers to a period in Earth's history, approximately 1.45 to 0.72 billion years ago, characterized by relative ...

Samuel Garrett does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

The first fossil record we have of fire comes from the Middle Ordovician period, billions of years later. In terms of fire, there is a sweet spot. Any lower than 13 percent oxygen, and plant ...

Amenorrhea is when you don’t get your period despite being old enough to have a menstrual cycle. It’s normal during certain stages of life, such as pregnancy or menopause. Unlike irregular ...