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Nanoparticles that are naturally occurring (e.g. volcanic ash or soot from forest fires) or are the incidental byproducts of combustion processes (e.g. welding, diesel engines) are usually physically and chemically heterogeneous, and are often termed ____________________.

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Engineered nanomaterials are artificially produced, and designed with very specific properties related to their shape, size, surface, and _____________.

During 6th-15th centuries, vibrant stained glass windows in European cathedrals owed their rich colors to nanoparticles of __________________ and other metal oxides and chlorides; gold nanoparticles also acted as photocatalytic air purifiers.

During 13th-18th centuries, "Damascus" saber blades contained __________________ and cementite nanowires—an ultrahigh-carbon steel formulation that gave them strength, resilience, the ability to hold a keen edge, and a visible moiré pattern in the steel that give the blades their name.

In 1951, Erwin Müller pioneered the field ion microscope, a means to image the arrangement of atoms at the surface of a sharp metal tip; he first imaged __________________.