1) Sir CV Raman was confident of winning the Nobel Prize in Physics after his famous discovery of Raman effect but was initially disappointed. He later won the Nobel Prize in Physics.
2) The 6th Rajputana Rifles is the oldest rifle regiment of the Indian Army, formed by amalgamating six existing regiments of the British Indian Army in 1921.
3) September 15 is celebrated as Engineer's Day in India every year in memory of M. Visvesvaraya, a notable Indian engineer and Diwan of Mysore from 1912 to 1918.