“A surgical declenching release valve is impractical because the blood would escape by gravity flow. It’s more practical to yawn and fart and burp.”

(surgical declenching release valve = hinged toenail)

“At high altitudes, atmospheric pressure is lower and, therefore, it is harder to breathe. Pressure in the chest decreases at the same time the pressure in the abdomen increases. The greater intra-abdominal pressure results in a tendency for liquids and foods to regurgitate or move from the stomach into the low pressure, intra-thoracic esophagus.”