Oxygen began entering Earth's oceans around 2.32 billion years ago, and shallow seas followed within a few million years.

You are taught early in science that oxygen on Earth comes from sunlight. Plants, algae, and cyanobacteria use light to split water and release oxygen, shaping the atmosphere and making complex life ...

Oxygen bars can be found in malls, casinos, and nightclubs. These “bars” serve purified oxygen, often infused with scents. The oxygen is administered into your nostrils through a tube. The purified ...

Oxygen therapy can help people with certain health conditions, such as emphysema, sleep apnea, or severe COVID-19, get enough oxygen to stay well and function. Oxygen therapy may be a temporary ...

Oxygen therapy helps people with emphysema breathe more easily. In the later stages of the illness, oxygen may also extend someone’s life. Emphysema is a type of chronic obstructive pulmonary disease ...

More than 1.5 million Americans use an oxygen concentrator for supplemental oxygen therapy. Oxygen concentrators can be rented or bought, depending on whether you are using it for short-term therapy ...

Don't let failing oxygen sensors compromise your engine's performance. O2 sensors are critical to emissions control on your car, SUV or truck. As the name implies, the O2 sensor (also called an ...

Sandra Gordon is a journalist specializing in health and medicine for consumers and healthcare providers. Her work has appeared in major magazines and websites, including Prevention, Parents, Medical ...