Tamil Nadu /ˈtæmɨl ˈnɑːduː/ (Tamiḻ Nāṭu [t̪amɨɭ naːɖɯ] ( listen)) is one of the 28 states of India. Its capital is Chennai, the largest city. Tamil Nadu lies in the southernmost part of the Indian Peninsula and is bordered by the union territory of Pondicherry, and the states of Kerala, Karnataka, and Andhra Pradesh. It is bound by the Eastern Ghats in the north, the Nilgiri, the Anamalai Hills, and Palakkad on the west, by the Bay of Bengal in the east, the Gulf of Mannar, the Palk Strait in the south east, and by the Indian Ocean in the south.

Tamil Nadu is the eleventh largest state in India by area and the seventh most populous state. It is the fourth largest contributor (as of 2010) to India's GDP and ranks tenth in Human Development Index as of 2006. Tamil Nadu is also the most urbanised state in India. The state has the highest number (10.56%) of business enterprises and stands second in total employment (9.97%) in India, compared to the population share of about 6%.

The region has been the home of the Tamil people since at least 500 BCE. Its official language Tamil has been in use in inscriptions and literature for over 2000 years. Tamil Nadu is home to many natural resources, Hindu temples of Dravidian architecture, hill stations, beach resorts, multi-religious pilgrimage sites and eight UNESCO World Heritage Sites.

Secondary education is the stage of education following primary education. Except in countries where only primary or basic education is compulsory, secondary education includes the final stage of compulsory education and in many countries it is entirely compulsory. The next stage of education is usually college or university. Secondary education is characterized by transition from primary education for minors to tertiary, "post-secondary", or "higher" education (e.g., university, vocational school) for adults. Depending on the system, schools for this period or a part of it may be called secondary schools, high schools, gymnasia, lyceums, middle schools, sixth-form, sixth-form colleges, vocational schools and preparatory schools, and the exact meaning of any of these varies between the systems.

Secondary education is a stage of education following primary school. Except in a few countries where only primary or basic education is compulsory, secondary education includes the final stage of compulsory education. However, secondary education in some countries includes a period of compulsory and a period of non-compulsory education. The next stage of education is usually college or university. Secondary education is characterized by transition from primary education for minors to tertiary, "post-secondary", or "higher" education (e.g., university, vocational school) for adults. Depending on the system, schools for this period or a part of it may be called secondary schools, high schools, gymnasia, lyceums, middle schools, colleges, vocational schools and preparatory schools, and the exact meaning of any of these varies between the systems.

3-2-1 Contact is an American science educational television show that aired on PBS from 1980 to 1988, and an adjoining children's magazine. The show, a production of the Children's Television Workshop, teaches scientific principles and their applications. Dr. Edward G. Atkins, who was responsible for much of the scientific content of the show, felt that the TV program wouldn't replace a classroom but would open the viewers to ask questions about the scientific purpose of things.

3-2-1 Contact was the brainchild of Samuel Y. Gibbon, Jr., who had been the executive producer of The Electric Company for CTW from 1971 to 1977. (Gibbon actually left CTW before Contact's production began, though he was still credited as "Senior Consultant.")

The first season of 65 programs began airing January 14, 1980 on select PBS member stations; it featured a cast of three college students who discussed science in an on-campus room known as the Workshop. The first season came to an end on April 11, 1980, but funds for more episodes were not sufficient until 1982.