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reflexion sur la rencontre can occur naturally (in the Earth, plants, or soot, for example) or be anthropic—generated by human activity. Volcanic ash and seashells contain nanoparticles. Although humans have been living with nanomaterials forever, it was not until recently that we had the technology to "discover" that our environment contains hundreds of thousands of nanoparticles per cubic centimeter. 

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rencontre sportive bordeaux However, nanoparticles can also be anthropic, which means that they are generated by human activity. The vast majority of anthropic nanoparticles are unintentional byproducts of phenomena like combustion, friction, or of manufacturing processes.

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rencontre sur vars Engineered nanoparticles are intentionally made by man. Engineering nanoparticles is one of the applications of nanotechnology. The resulting materials are intentionally nanostructured to give them special and often innovative properties. A "full-size" material's mechanical, chemical, magnetic, electrical, and other properties change when the material manufactured at the nanometric (one millionth of a millimeter) scale. It is these modified properties that have made nanomaterials a source of hope for solving some of our planet's major challenges, from saving resources and energy to curbing pollution and preventing infectious diseases.

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rencontre dans un pub However, engineered nanoparticles do raise some legitimate safety questions. Are nanoparticles safe to use in everyday items? What is their impact on the environment?

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