1922 - Four doctors at the University of Toronto - Frederick Banting, Charles H. Best, James Bertram Collip, and J.J.R. Macleod - discovered a secretion: a substance that is produced by some part of a plant or animal.secretion of the pancreas that helps burn the sugar in our blood and convert it to energy. They called the secretion insulin. Later, mass production of insulin would help diabetics who produce too little of that hormone: a substance formed in certain parts of the body which enters the bloodstream and influences the activity of some organ.hormone. Banting and Macleod were awarded the Nobel Prize for Medicine in 1923. Banting gave half his prize money to Best and Macleod gave half his prize to Collip.

1927 - Edward Samuel Rogers, at the age of 27, invented the first battery-less radio tube which ran on alternating current (AC). Before this, home radio receivers had to be operated with rechargeable batteries. Now a radio could be developed which plugged into an electric socket in the home. His son, the late Ted Rogers, was the head of communications giant Rogers Cablesystems.

1920s - Writer and historian Abbé Groulx was editor of the Quebec nationalist journal L'Action française. Abbe Groulx felt that Quebec's traditional values - the church, the family and the agrarian roots of the society - were being threatened by increasing urbanization and industrialization. This new economy was invariably controlled by English-speaking, often American, interests. Groulx and the other contributors to the journal called for greater French-Canadian control of the economy and more say for Quebec within Confederation. At one time Groulx even advocated political independence for Quebec.

1928 - In the late twenties three doctors (Drake, Brown & Tisdall) from the Hospital for Sick Children in Toronto developed a pre-cooked nutritious cereal for babies. They called it Pablum, which derives from "pabulum" - Greek for "food." It was made from wheat meal, oatmeal, cornmeal, wheat germ, bone meal, dried brewer's yeast and alfalfa. Royalties from the sale of Pablum still go to the HSC.