A handful of species on Earth share a seemingly mysterious trait: a menstrual cycle. Were one of the select few mammals on Earth that menstruate, and we also do it more than any other animal, even though its a waste of nutrients, and can be a physical inconvenience. So wheres the sense in this uncommon biological process? TED-Ed describes the history and evolution of menstruation.
Lesson by TED-Ed Date: 2020-08-22
