Most people have heard of Mother Teresa, the Christian nun who spent her life helping the poor and needy in the slums of India.
As the world marks one hundred years since her birth, Al Jazeera is looking at people around the world who have devoted their lives to helping others.
One of those unsung heroes is a 91-year-old Egyptian women from Alexandria.
Inaya Essafti works to empower women by teaching them how to read.
Al Jazeera's Ayman Mohyeldin has her story.