Sex is determined by chromosomes, and gender is a social construct that can vary between time periods and cultures. Both of these aspects are acknowledged to exist on a spectrum both historically ...

Learn more about the time period that took place 488 to 443 million years ago. 3 min read During the Ordovician period, part of the Paleozoic era, a rich variety of marine life flourished in the ...

Often, analysts have to compare projects with benefits and costs that arise in different time periods. Formally, they have to make intertemporal (across time) comparisons. To do this, analysts ...

Ask any woman and she'd tell you how annoying periods are. There is absolutely no escape when it's that time of the month.

From 'Auntie Flo' to 'time of the month', how many ways can you avoid saying the word 'period'? Whether it's menstruation or menopause, talking about periods has often been a taboo subject.