One day some theology types were sitting around and talking about human beings, and in particular what a wonderful engineering achievement the human body is. The the conversation turned to God, and somebody asked what kind of engineer God is, being that he designed the human body.

The first guy said "He's a chemical engineer. Just look at all the amazing chemistry - DNA, proteins, saliva, etc..."

"No, he's a mechanical engineer" replied another. "Just look at the bone structure, all the mechanisms, all the forces involved; and look at the wonderful heating and cooling systems."

"No no no" replied yet another. "He's got to be an electrical engineer. Only an electrical engineer could design the brain with all the electrical impulses and nerve networks and such."

"Nope, you're all wrong" said another confidently. "God is in fact a civil engineer. Only a civil engineer would put a waste treatment plant right next to a recreational facility!"