Found in rock samples retrieved in Australia more than 60 years ago, the microfossils dating to the Lower Ordovician Period, approximately 480 million years ago, fill an approximately 25-million-year ...

Explore the hidden gems of Wisconsin - from breathtaking landmarks to historical sites that highlight the state's unique ...

Late or missed menstrual period Late period: 5 or more days late compared to normal menstrual cycle Missed period: no menstrual flow for more than 6 weeks Teen not using any birth control that stops ...

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 ...

Cramps aren’t always a sign of menstruation. Many people develop cramps when they don’t have their period. There are various causes of cramps with no period. Issues related to pregnancy are often to ...

They play a key role in coastal ecosystems. Researchers have now characterised the genomes of 60 brown algae species around ...

This period saw the emergence of complex terrestrial ... Finally, a reevaluation of the Cambrian Explosion and the Great Ordovician Biodiversification Event has led to new insights into early ...