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Pulse oximeter: What it measures, how it works, and how to read it

A pulse oximeter is a small device that can measure the oxygen saturation in your blood. Pulse oximetry is useful for people with chronic lung or heart conditions, who need to monitor how well oxygen is being sent from the heart and lungs out to the furthest parts of the […]
Pulse oximeter: What it measures, how it works, and how to read it
US

How U.S. cities would look without the Clean Air Act

VIDEO: The Clean Air Act was passed in 1970, and current regulations are based on an amended version passed in 1990. The legislation enabled federal and state authorities to establish comprehensive regulations for air pollutants. SaveOnEnergy, an online energy marketplace, came up with images showing the worst case scenario without proper regulation.
How U.S. cities would look without the Clean Air Act