Oliguria occurs when you urinate less than 400 mL of urine per day. It’s usually a symptom of kidney problems, and may be caused by dehydration, injury, or some medications. Most people without ...

This story appears in the September 2016 issue of National Geographic magazine. On January 10, 2019, a group of scientists reported in the journal Science that the world’s oceans nearly doubled the ...

Congolese soldiers and combatants from a pro-government militia have re-entered the eastern town of Uvira, residents said on Monday, just over a month after it fell to Rwanda-backed M23 rebels in a ...