Particles breathed or ingested with contaminated food can enter our body. Inhaled 0.1-micron or 100-nanometer particles do not stop in the lungs but can cross the lung barrier in 60 seconds and in an hour reach the liver, the kidneys and all internal organs including the brain. Once in the blood, they can give rise to interactions or, better, to nano-bio-interactions with blood components and trigger diseases such as leukemia or a form of cancer in the organ where they are deposited