Researchers from the Institute of Toxicology and Genetics at the Karlsruhe Research Center in Karlsruhe, Germany, exposed human lung cells to single-walled carbon nanotubes (SWCNTs) – large cylindrical carbon molecules – and conducted several tests to determine the nanotubes' effect on the cells' viability. Three tests showed the nanotubes to be non-toxic, but a fourth curiously produced the opposite result.
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