现代科学研究说热爱登山攀岩蹦极之类极限运动的人很多有一个多巴胺受体DR4的变异基因，这种人就喜欢追求刺激的濒死的体验……
QOTO: Question Others to Teach Ourselves An inclusive, Academic Freedom, instance All cultures welcome. Hate speech and harassment strictly forbidden.
