On the shores of Lake Erie, in Cleveland, the United States, there once stood a giant steel sphere sixty-four feet tall. Inside the sphere were 38 rooms where Dr. Cunningham’s patients spent up to two weeks at a time breathing air at twice the atmospheric pressure. Dr. Cunningham believed that the higher air pressure introduced oxygen in abundance into the body system and aided in the therapy of various diseases. This is known as hyperbaric oxygen therapy.
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