Mr. Spaceship

Mr. Spaceship is a sci-fi story by Philip K. Dick. In the faraway future, humankind is at war with an alien life form which does not use conventional spaceships nor constructions. The war has been going on over a long period of time, and humanity has failed in coming up with a working solution against the life-form-based ships that the "Yuks" utilize. A researcher named Philip Kramer decides to build a spacecraft which is powered by a human brain, but whose brain? And this is just the beginning of this phenomenal adventure!