Some Notable contribution of Tamils

The whole nation is jealous on Tamils for their achevements and hence such questions are posted on Quora...

1.Security in Tihar jail is by Tamilnadu special force.
2.Of total three Oscar awardees Rahman Spoke in tamil when he received the award. Not counting Ray`s award because it is just a honorary award
3.Srinivasa Ramanujan (1887–1920) known for his contributions to mathematical analysis, number theory, infinite series and continued fractions is a Tamilian
4. Tamil movies win the highest number of national awards among all south indian movies.
5.Tamil is one of the official languages in Singapore, Srilanka, south africa and malaysia.

Tamil People who were Heads of other countries

Veerasamy Ringadoo (1920–2000), was Governor-General & President of Mauritius.
Angidi Veeriah Chettiar, Acting President of Mauritius (Feb 15, 2002 – Feb 18, 2002).
Ariranga Govindasamy Pillay, Acting President of Mauritius (Feb 18, 2002 – Feb 25, 2002).
S.R. Nathan, President of Singapore (September 1, 2002 – August 31, 2011).

Tamil people with international positions

Navanethem Pillay – High Commissioner for Human Rights, UN. In 2009, Forbes ranked her as the 64th most powerful woman in the world.
Radhika Coomaraswamy – Under-Secretary-General of the United Nations, Special Representative for Children and Armed Conflict
James Appathurai – Spokesperson for NATO.
Arcot Ramasamy Mudaliar – served as the first President of the United Nations Economic and Social Council, Member of the Viceroy`s Executive Council.

Indian Presidents from Tamilnadu

Sarvepalli Radhakrishnan Former President of India from 1962 to 1967, Bharat Ratna Awardee
R. Venkataraman Former President of India July 25, 1987 – July 25, 1992. Before that he was the Vice President of India.
A. P. J. Abdul Kalam former President of India, Bharat Ratna Awardee, Missile Man of India.

Tamils in Indian Independance movement

V.O. Chidambaram Pillai Indian revolutionary born
Muhammadh Yusuf Khan alias Marudhanayagam Military leader of the 18th century
Puli Thevar, Polygar chieftain who fought against and win over British East India Company in the 1750s and 1767s
Rettamalai Srinivasan (1860–1945), Dalitactivist, politician from the Indian state of Tamil Nadu
Dheeran Chinnamalai (1756–1805), Polygar chieftain and feudatory of Tipu Sultan who fought the British in the Second Polygar War
Subramanya Bharathi (1882–1921), Tamil poet and social reformer. Often regarded as the national poet of Tamil Nadu
Bharathidasan (1891–1964), Tamil poet and rationalist.
V. Kalyanasundaram (1883–1953), Scholar and independence fighter
Subramaniya Siva (1884–1925), writer
Jeevanandham (1907–1963), Social reformer, political leader, litterateur and one of the pioneers of the communist and socialist movements
Champakaraman Pillai (1891–1934), independence fighter
Tiruppur Kumaran (1904–1932), Indian Revolutionary
Muhammad Ismail (1896–1972), "Quaid-E-Millat," Member of Parliament and was the President of Indian Union Muslim League
K. Kamaraj, Former Chief Minister of Tamil Nadu and All India Congress President
M. Bhaktavatsalam (1897–1987), Former Chief Minister of Tamil Nadu
C. Subramaniam (1910–2000), one of the men behind the Green Revolution
Lakshmi Sehgal (1914–2012), Head of Rani Jhansi Brigade, women`s wing of the Indian National Army and a close associate of Netaji Subhas Chandra Bose. Presidential candidate in 2002 President`s election.
Chempakaraman Pillai,was an Indian revolutionary during the Anti-British Movements in India, who went abroad to organize an army to declare war against the British to establish self-rule in the Indian subcontinent.

Source: http://www.quora.com/Ways-to-Annoy-or-Insult-X-Group/What-is-the-best-way-to-annoy-a-Tamilian