Street Sweeper Blues

I looked out my front window this morning to the following scene. What's wrong with this picture? Isn't the street supposed to be cleaner behind the Street Sweeper than in front of the Street Sweeper?

This next one is after the dump truck came and he emptied his bucket.
Still making messes.
Our son went out to investigate. The man explained to him, "When the dirt builds up inside it starts to throw stuff out onto the street. The sweeper driver calls for help to clear the built up stuff out. They reversed the conveyor belt to throw it out. They have to spread the dirt out. And then go over it several times to pick it back up." [quote from our son]
Pretty cool stuff!
Real life learning is the best!
Our son will remember what he learned much longer than what we read in a book.
Although I will probably look for something at the library to enhance what he learned if he seems interested.