This book provides information to the state of art of research in natechlogy and na medicine and risks of na techlogy. It covers an interdisciplinary and very wide scope of the latest fundamental research status and industrial applications of na techlogies ranging from na physics, na chemistry to biotechlogy and toxicology. It provides information to last legislation of na usage and potential social impact too. The book contains also a reference list of major European research centers and associated universities offering licences and master of na matter. For clarity and attractivity, the book has many illustrations and specific inserts to complete the understanding of the scientific texts.