World's End and The Sea Angle - Yank Shi - Bog

Graduate students David, a white man, and Emily, a student from China fall in love with each other on the campus of the University of Colorado at Boulder. They are fascinated by sprawling topics like the universe, the world, and human beings. When David is caught by a tornado on the Kansas plains he is carried to a time-space tunnel which he traverses along. Stranded in East Africa during the Stone Age, David experiences primitive life and strange romantic adventures. David and Emily fall accidently into a time-space tunnel in Bermuda Triangle and traverse to the future world. They enjoy the perfection of the future society. There they have some fantastic experiences. Finally, they witness the tragedy of the World End. By chance, they return to the present world by reverse crossings. David and Emily reunite and explore the cosmos together. They make new discoveries and create new theories about the world and the universe.