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Spertzel WSJ article
Another FBI leak indicated that each particle was given a weak electric charge, thereby causing the particles to repel each other at the molecular level. This made it easier for the spores to float in the air, and increased their retention in the lungs.
In technical terminology, the manipulation of particle charge at the micron level is called "nanotechnology". Only one company in the world combines advanced nanotechnology with vaccine research and directly benefitted from Bioshield