QUOTE FOR WEDNESDAY:

“Oxygen, although it is essential for aerobic organisms for respiration as well as energy production, has been therapeutically used for a long time. It also can be either toxic or lethal for humans if it is continuously inhaled pure for about 60 hours.”

U.S. National Library of Medicine/National Institute of Health http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3231820/

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