**8. Conclusions**

John H. J. H. Fenton did not know that his discovery would enthrall a legion of researchers, be championed by two Noble laureates, and create three separate fields of peroxide oxidation chemistry: hydroxyl radicals (HO•), ferryl-oxo ions (Fe = O)+2 and perferryl-oxo ions (Fe = O)+3.

Fenton's successors required a full century to explain the ramification of these reactants. These three simple molecules continue to generate novel research investigations in chemistry, physics, and biology. I am proud to be among Fenton's successors.
