Tagged: cycle

Osteopenia: what to do about bone loss

It’s easy to take your bones for granted—until you break one. As we grow older, our bones become weaker and more brittle because of reduced density, loss of mass, and deterioration of bone architecture....

Why do women have periods?

A handful of species on Earth share a seemingly mysterious trait: a menstrual cycle. We’re one of the select few mammals on Earth that menstruate, and we also do it more than any other...

Why do we dream?

In the 3rd millennium BCE, Mesopotamian kings recorded and interpreted their dreams on wax tablets. In the years since, we haven’t paused in our quest to understand why we dream. And while we still...