Mike Rowe first joins a crew at a rock quarry in Washington and learns what it takes to make gravel from loading rocks to blowing up a side of a mountain. Next, Mike gets hip deep in mud and muck working with the hippo keepers at the Adventure Aquari... (more)um in Camden, NJ. Finally, Mike helps a crew of hooftrimmers give some cows a pedicure and later cleans a cow foot bath.