Abstract
We obviously agree with Wu et al. that H(2)O(2) might accumulate in the Archean land waters devoid of Fe(2+). We do disagree on the topic of the half-life of H(2)O(2), as the work cited in support for a longer half-live is not relevant to the conditions in the Archean ocean. While the existence of radicals in quartz is not in doubt, we do question the hypothesis that these radicals oxidize water to HO(•) and H(2)O(2).