AN ELEMENT-AL CATEGORY
'(<a href="http://www.j-archive.com/media/2009-01-01_DJ_27.jpg" target="_blank">Jimmy of the Clue Crew reports from a bedside.</a>)  Here at the sleep center at Stanford Hospital and Clinics, one of the 32 devices attached to a subject measures the levels of this element in the blood, which can be an indicator of sleep apnea'
oxygen