Mother Teresa was born in Yugoslavia in 1910 and joined a convent at age 18, taking the name Sister Teresa. She taught at a girls' Catholic school in India for many years. While on a train, she felt called by God to leave her convent life and minister to the poorest people on the streets of Calcutta. In 1948, she left the convent and founded the Missionaries of Charity in 1950 to care for the sick and dying in Calcutta. Mother Teresa won the Nobel Peace Prize in 1979 for her service and died in 1997 at age 87, with her order continuing her work for the poor.