Researchers Jeff Crooks and Stephany Garcia checked the minnow traps left at the murky mouth of the Tijuana River on a sunny October morning. They didn’t expect any catches. They haven’t had any for ...

Blood oxygen levels refer to the amount of oxygen circulating in the blood. Normal blood oxygen levels fall between 75 and 100 millimeters of mercury (mm Hg) on arterial blood gas (ABG) test results.

Lindsay Modglin is a nurse and professional writer who regularly writes about complex medical topics, as well as travel and the great outdoors. She holds a professional certificate in scientific ...

A dangerously low oxygen level—usually below 92%—can cause shortness of breath, confusion, chest pain, or fainting. It’s ...

Oxygen fills the air today, but for most of Earth’s early history it barely existed. Scientists say the atmosphere did not hold steady oxygen until about 2.

Janay Reece came back home to Baltimore to join WJZ in August 2023. Before coming back to the Charm City, Janay was a morning anchor and reporter for WDBJ7 in Roanoke, VA. She joined the WDBJ7 morning ...