San Jose, CA - The 4th International Congress of Nanotechnology 2007 (ICNT2007) and the 1st Clean Tech World Congress 2007 will be held on November 5-8, 2007, in San Francisco. A faculty of distinguished speakers and experts from around the world will address state-of-the-art scientific developments, as well as business and investment opportunities in the emerging field of Nanotechnology and Clean Tech. For further information, visit http://nanotechcongress.com.