Listen to the Summary of Kris Verburgh's The Longevity Code in 20 minutes. Please note: This is a summary & not the original book. The ancient Greeks believed that aging was the result of overheating, and that the heart produced a sort of heat that heated the entire body and kept it working. The lungs were there for cooling. The heating heart and cooling lungs kept each other in balance, but that balance was not perfect and the body aged because of this...