 Energy covers the surface while the underground remains cool, making caves a refreshing shelter. Conversely, during the winter, the Earth's yang energy sinks underground, making caves feel warm. That's a very interesting way they look at this stuff. Similar principles can be applied to the human body. During the summer, the body's pores open up, allowing energy to dissipate on the surface and facilitating sweating. However, the internal organs remain relatively cool, therefore,