What is the most important scientific discovery to come out of Canada?

Canada has contributed many important discoveries and breakthroughs in science. One of the most significant discoveries was the identification of insulin by Canadian scientists Frederick Banting and Charles Best in 1921. The discovery of insulin revolutionized the treatment of diabetes and has saved countless lives since its discovery.

Other important scientific discoveries to come out of Canada include the invention of the cardiac pacemaker, the discovery of stem cells, and the development of the Canadarm for use on the International Space Station. Canada also played a key role in the development of the field of artificial intelligence, with significant contributions from Canadian computer scientists such as Geoffrey Hinton and Yoshua Bengio.