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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 University of Pisa, Adjunct Professor at Naval Academy, Leghorn (Italian Navy). E-mail: [email protected] Introduction The interest on Andrea Rossi's Nickel-Hydrogen Cold Fusion technology is accelerating [1]. However, Rossi says that about 30% of nickel was turned into copper, after 6 months of uninterrupted operation. Kowalski [2]. says that “this seems to be impossible because the produced copper isotopes rapidly decay into Ni”. But how it works? How it works Following Focardi Rossi [3]. a Ni58 nucleus produces a Copper nucleus according to the reaction Ni58 + p → Cu59 Copper nucleus Cu59 decays with positron (e+) and neutrino (ν) emission in Ni59 nucleus according to Cu59 → Ni59 + ν + e+ Then (e+) annichilates with (e-) in two gamma-rays