For almost two years, molecular biologist Benedicte Trouiller doused the drinking water of scores of lab mice with nano titanium-dioxide, the most common nano particle used in consumer products today. She knew that earlier studies in test tubes and Petri dishes showed the same particle could cause disease, but her tests at UCLA’s School of Public Health were in living animals and thus regarded by some scientists as more relevant in assessing potential human harm. Half way through, Trouiller became alarmed: the titanium-dioxide was damaging or destroying the animals’ DNA and chromosomes. The findings were repeatedly confirmed as she repeated the tests again and again.
http://www.aolnews.com/nanotech/article/amid-nanotechs-dazzling-promise-health-risks-grow/19401235