Rene Laennec, a French physician, invented the stethoscope in 1816.
He created the first stethoscope using a wooden tube that allowed him to listen to the heart and lungs of a patient without placing his ear on their chest.
The three Round Table Conferences of 1930–32 were a series of conferences to formulate future constitution of India in the light of suggestions given by the Indian Leaders
Sir Agha Khan also first president of Muslim League.
The first Round Table Conference convened from 12 November 1930 to 19 January 1931
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The Second Round table conference was held from 7 September 1931 to 1 December 1931 in London.
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The Third Round Table Conference was held in 1932 between November and December.
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First round table conference: 1930
2nd: 1931
3rd:1932
All in London
All three round table conferences were attended by Dr. B.R. Ambedkar and Tej Bahadur Sapru.
The main driver of climate change is the greenhouse effect.
Some gases in the Earth's atmosphere act a bit like the glass in a greenhouse, trapping the sun's heat and stopping it from leaking back into space and causing global warming.
