riding through the city. it literally is the center of paris tonight a mass of sirens going in one direction or another. that is a water cannon. if you see it in the middle of the road, the police brought it in in case they needed to use it. it seems as if the police are determined to make sure the center of paris is safe. a lot of people. that funeral, as you say, passed off peacefully earlier in the day. that was another acid test for the mood of the street here. nic robertson, thank you. and too often, people working hard to improve the lives of others did not receive the recognition they deserve. cnn heroes is sharing their stories to help them continue the work that makes them so special.