Mining the Genre Asteroid: The Gods Themselves by Isaac Asimov
A mysterious source of energy from another universe and the emergence of particles that should not exist according to principles of modern physics and chemistry. And thus, when they decay, they release free, clean energy. Who cares about the motives of the para-men in the parallel universe who are sending the atoms of impossible Plutonium 186 to us in exchange for atoms of Tungsten 186 (equally unstable in their world), right? The Electron Pump is a benefit to both sides, right? Or is it? Is the Electron Pump really that benign, or is it a devilish energy trap designed to foster dependency on it, or worse, be actively harmful to both humans and aliens alike? Once the Pump is in operation, can a source of limitless free energy that threatens the survival of two civilizations even
