What might riots tell us about life in France?

Riots spread from Paris to many French cities after the killing by police of Nahel M, a 17-year-old boy of Algerian origin. The unrest has been described as unprecedented in terms of scale and intensity. While the riots were sparked by the death of Nahel, it has also raised questions about race and poverty in France. So, what can the past two weeks tell us about life in the country?