It bears repeating

with the inadvertently-omitted word (in bold!)

I was heartened, though, at the thought expressed by economic philosopher John Roemer, of Yale University, who knows much more than I do about these matters, when he wrote the other day to say “I think the formulation of the first, second, third.... Reconstructions is incisive. It reminds me of the way we measure the lifetime of a radioactive mineral. We celebrate its half-life, three-quarters life, etc..... but the radioactivity never completely disappears. Racism, like radioactivity, dissipates over time but never vanishes.”