The reason most of the children are having problems in any inner-city neighborhood is because they don't see enough positive role models in their own environment.
As with anything, you need to keep your creative juices flowing and keep the character interesting.
For fossils to thrive, certain favorable circumstances are required. First of all, of course, remnants of life have to be there. These then need to be washed over with water as soon as possible, so that the bones are covered with a layer of sediment.

