This one was probably a little bit "inside baseball-y" for general consumption. It assumes that you know what reinforced concrete is, and why worms wouldn't really be a good addition to reinforced concrete. Perhaps that's why this one languished in the drawer for so long.
Thanks for humoring me. Just smile and say, "Thanks for sharing."
Oh, and, speaking of worms, that reminds me -- tonight's the spaghetti feed at the high school! Come on down!