Learn more about the common causes of fainting and lightheadedness, including dehydration, low blood sugar, heart issues, flu ...

Climate change is causing rivers to slowly lose oxygen, threatening fish and other life in the waterways, a new study shows.

If you’ve ever fainted, you know it can be a scary experience. Understanding why you fainted can help you manage your next spell of lightheadedness. We asked doctors to explain common reasons for ...

According to a study published in Science Advances on May 15, global rivers are undergoing widespread and sustained deoxygenation driven by climate warming, among which tropical rivers are the most ...

We consider why fertility has fallen in recent decades in almost all high-income countries. We begin by documenting declining total fertility and rising childlessness across cohorts, highlighting the ...

The world's oceans are losing oxygen—and rapidly. The principal cause is the increasing warming of the oceans, which reduces ...