Paul’s father liked breaking things. He broke telephones, and he broke walls, and he broke tables. He broke promises not to hit again. One time, he broke bones; the police were called by the ER physicians who did not believe the story about Paul’s mother falling down the stairs. They did not believe the weeping woman of porcelain who swore her husband had not touched her.

Paul’s father was a force of nature, a cataclysm; as unpredictable as a comet strike or a volcanic eruption. The attic was a good place to hide, and Paul threw himself into his hobby.

Paul studied his mice as though they were Goodall’s chimps. He documented their social interactions in a green spiral notebook. He found that, within the large habitats, they formed packs like wolves, with a dominant male and a dominant female—a structured social hierarchy involving mating privileges, territory, and almost-ritualized displays of submission by males of lower rank. The dominant male bred most of the females, and mice, Timothy learned, could kill each other.

Nature abhors a vacuum, and the mouse populations expanded to fill the new worlds he’d created for them. The babies were born pink and blind, but as their fur came in, Paul began documenting colors in his notebook. There were fawns, blacks, and grays. Occasional agoutis. There were Irish spotted, and banded, and broken marked. In later generations, colors appeared that he hadn’t purchased, and he knew enough about genetics to realize these were recessive genes cropping up.

Paul was fascinated by the concept of genes, the stable elements through which God provided for the transfer of heritable characteristics from one generation to the next. In school they called it divine transmission.