material. Due to this material, they are stronger than any material in the solar system and thus are impervious to any physical attack. Their propulsion system is capable of moving in any direction in 3D space. Seemingly unaffected by inertia, they can make sudden impossible turns, and their primary method of attack is to simply smash through objects. Curvature Propulsion Simplified in a demonstration as a piece of soap attached to a paper boat on water, with the soap reducing the water tension at its end, and the water tension disparity propelling the boat. Traveling through previous paths slows the boat down due to decreased surface tension. Curvature Propulsion is a method of light speed travel that utilizes the same concept, via reducing the speed of light it is possible to drag a ship through space at light speed, while its wake is a reduced light-speed region of space. Hibernation Humanity by the time of the Dark Forest has developed cryogenic technology, capable of preserving a human life, unaging, for hundreds of years barring certain genetic disorders. Initially, it is viewed as a sign of inequality before it is fully developed, viewed as a way for the rich to simply skip through the centuries to eras of more advanced technology, peace, and human development. With the advent of the Trisolaran invasion, however, it becomes a near-worthless technology in terms of demand, as people prefer to die naturally in a world still free from Trisolaris rather than skip ahead to doomsday. Because of this, only researchers and certain high-value staff make use of cryogenics to skip through time. Cosmic sociology The study of theoretical interactions between cosmic civilizations. This area of study is first proposed by the character Ye Wenjie in conversation with future Wallfacer Luo Ji. Ye Wenjie proposes two axioms of cosmic sociology: "First: Survival is the primary need of civilization. Second: Civilization continuously grows and expands, but the total matter in the universe remains constant." After becoming a Wallfacer, Luo Ji uses the axioms provided by Ye Wenjie to invent the dark forest theory of the universe and the idea of dark forest deterrence to stop the Trisolaran invasion. Adaptations The Three-Body Problem () is a postponed Chinese science fiction 3D film, adapted from The Three-Body Problem, directed by Fanfan Zhang, and starring Feng Shaofeng and Zhang Jingchu. A Chinese animated series based on The Three-Body Problem began