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 universes along. Stranded in East Africa during the Stone Age, David experiences primitive life and strange romantic adventures. David and Emily fell accidentally into a time-space tunnel in the Bermuda Triangle and traversed to the future world. They enjoy the perfection of a future society. There, they had some fantastic experiences. Finally, they witness the tragedy of the World End. By chance, they return to the present world through 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.