Hallam's accidental Electron Pump discovery
Radiochemist Frederick Hallam finds his tungsten sample inexplicably turned into plutonium-186, an isotope impossible under our physics, which was actually sent from a parallel universe whose inhabitants built the Electron Pump. Hallam takes credit as its 'father' and becomes a celebrated hero, then uses his authority to crush Peter Lamont's evidence that the exchange is slowly strengthening the strong nuclear force in our universe and will eventually make the Sun go nova. The story shows how a free, clean energy source, together with the reputation of the person credited with it, makes a civilization refuse to hear that the source is lethal.
