Kibera is a poor neighborhood in Nairobi. It is built in a valley on ground that is partially made of trash.  There is a river at the bottom. 

Inside the neighborhoods, the homes are made of mud or tin.  They are small, and they are packed closely together.  Between the homes, there are open sewers.  People braided hair there, they washed clothes.

On one ridge, there is a railroad, and when the train comes through, it shakes everything to pieces.

I asked Fred how many people lived in Kibera.  “A lot,” he said.  “A lot a lot.”