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Nanotechnology is a broad term used in science to describe anything that is less than 100 nanometers in size. A nanometer is one-billionth of a meter. Nanotechnology is being used in all areas of science, including medicine. Some of the ways in which tiny, molecular devices are being used in medicine include treating degenerative brain diseases like Parkinson’s and Alzheimer’s, using small particles in dental surgery, in tissue engineering, in fighting antibiotic resistance, and in the treatment of cancers, including mesothelioma.