Contents: Pollen grains (wm, st, 40X) • Volcanic dust (wm, em 8,400X/24,800X) • Sulfuric acid droplet (wm, em, 62,800X) • Quartz sand (wm, 210X) • Fly ash and soot (wm, 210X) • Blackened white house walls (wm, 210X) • Blackened lungs (cs, st, 65X) • Asbestos (wm, 210X).
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