Why the research journals, magazines, newspapers even literate and illiterate society talk about nanoscience and nanotechnology? Why every addresses of our former President of India, A.P.J. Kalam had advised to the scientific community to promote nanoscience and nanotechnology in our country? Why huge packages were announced in the past years to promote nanoscience and nanocenters in India? Developed and developing countries had already opened new courses, departments and nanocenters especially for nanoscience. Why the peoples are so interested and eager in this field of science? A brief account on the development of nanoscience and nanotechnology is reported in this article.