The accidental discovery of insulin in 1921 by Frederick Banting and Charles Best marked a momentous turning point in the treatment of diabetes. Seeking a way to alleviate the suffering caused by this devastating disease, Banting and Best embarked on a series of experiments at the University of Toronto. In one fateful experiment, they sought to isolate a pancreatic substance that could potentially regulate blood sugar levels. Through a combination of fortunate circumstances and rigorous scientific inquiry, they accidentally purified insulin instead. The profound impact of this discovery became apparent when they injected this newfound hormone into a diabetic dog, witnessing a rapid reduction in its blood sugar levels. This remarkable breakthrough led to the development of insulin therapy, enabling countless individuals with diabetes to manage their condition effectively and live healthier lives.