In the present article I would like to answer a question posed by L. Kowalsky in a recent paper: how can 30% of nickel in Rossi’s reactor be transmuted into copper? "Everything should be made as simple as possible, but not simpler", says a guy. I apologizes if I am too simplistic here. ________________ * Retired. Earlier: Selenia SpA, Rome and IDS SpA, Pisa. Also Adjunct Professor at the Univer...