Studies have shown that people release large quantities of endorphins (an opioid produced by the body that is ten times more potent than morphine) during times of extreme crisis to prevent mental and physiological collapse.
科學研究顯示，人類暴露在危機時，腦內啡 *（一種由大腦製造的天然生化物質，其麻醉效果是嗎啡的 10 倍以上）會大量分泌，以保衛自己的心理和生理不致崩潰。