by Pe­ter Set­low — Amid the furor sur­round­ing the an­thrax at­tacks in the USA in 2001, sig­nif­i­cant at­ten­tion was fo­cused on whether the Bacil­lus an­thracis spores used had been "weaponized" by the adding of a coat­ing of fumed sil­ica to aid in their dis­per­sal. This in­for­ma­tion might have helped pin­point where the spores had orig­i­nated. How­ever, a con­fus­ing fac­tor was that...