Meghnad Saha FRS (6 October 1893 – 16 February 1956) was an Indian astrophysicist who developed the Saha ionization equation, used to describe chemical and physical conditions in stars. His work allowed astronomers to accurately relate the spectral classes of stars to their actual temperatures. He was elected to the Parliament of India in 1952 from Calcutta.

Meghnad Saha was born in 1893 in a very poor family in Shaoratoli, a village near Dhaka-Bikrampur, in the former Bengal Presidency of British India (in present-day Village- Shaoratoli, Thana- Kaliakair, District- Gazipur, Bangladesh). Son of Jagannath Saha (a grocer) and Smt. Bhubneshwari Devi, Meghnad struggled to rise in life. During his early schooling he was forced to leave Dhaka Collegiate School because he participated in the Swadeshi movement. He earned his Indian School Certificate from Dhaka College. He was also a student at the Presidency College, Kolkata and Rajabazar Science College CU. As a student, Saha faced caste discrimination from his fellow upper-caste students. When Saha was at Eden Hindu Hostel, upper-caste students objected to him eating in the same dining hall because he was not from upper caste. He was also a professor at Allahabad University from 1923 to 1938, and thereafter a professor and Dean of the Faculty of Science at the University of Calcutta until his death in 1956. He became Fellow of the Royal Society in 1927. He was president of the 21st session of the Indian Science Congress in 1934.

For more details visit: https://en.wikipedia.org/wiki/Meghnad_Saha

Birsa Munda pronunciation (help·info) (15 November 1875 – 9 June 1900) was an Indian tribal freedom fighter, and folk hero who belonged to the Munda tribe. He spearheaded a tribal religious millenarian movement that arose in the Bengal Presidency (now Jharkhand) in the late 19th century, during the British Raj, thereby making him an important figure in the history of the Indian independence movement. The revolt mainly concentrated in the Munda belt of Khunti, Tamar, Sarwada and Bandgaon.

Birsa received his education in Salga under the guidance of his teacher Jaipal Nag.Later, Birsa converted into a Christian to join the German Mission School but soon dropped out after finding out that Britishers were aiming to convert tribals to Christianity through education.

After dropping out of school, Birsa Munda created a faith called ‘Birsait’.

Members of the Munda community soon started joining the faith which in turn became a challenge for the British conversion activities.

The cause of the Munda revolt was the ‘unfair land grabbing practices by colonial and local authorities that demolished the tribal conventional land system’.

Birsa Munda is known for challenging the Christian missionaries and revolting against the conversion activities along with the Munda and Oraon communities.

His portrait hangs in the Indian Parliament Museum.

For more visit: https://en.wikipedia.org/wiki/Birsa_Munda