(1) (1829) Prussian physician Marie Elisabeth Zakrzewska is born. She is best known for establishing the New England Hospital for Women and Children, the only hospital at the time that offered health care to women and children.
(2) (1876) Scottish biochemist and physiologist John Macleod is born. He is credited with discovering and isolating insulin, for which he shared the 1923 Nobel Prize in Physiology or Medicine.
(3) (1906) Argentine physician and biochemist Luis Federico Leloir is born. He is known for his work on sugar nucleotides and carbohydrate metabolism, which has led to more understanding of the disease galactosemia (improper metabolization of the sugar galactose).