Seems he noted something right. Jeremiah's still so deathly curious in turn about these other worlds, but that conversation can wait. He turns and looks up the curved face of his machine.

"Precisely." Unfortunately not enough of them, but. Some. At least his apartment has it. He'll take what he can get. "Radioactive materials... essentially decay over time, sometimes very very slowly, releasing energy as they do so. Because this can take years and years to do, they make for a good long-term power source."

He ponders, looking a little dubious of himself. His classes in basic were years ago, and high school chem even further back. That just dredges up flashbacks, no thanks.