I even entered a sewer pipe to look inside.
The Dutch wouldn't be Dutch if they hadn't invented a bike to inspect the sewer pipes in the past.
There were lots of things to see and learn, all concerning water. Here you can see a man and his son cycling along the riverside. The son asks questions and you have to give the answers.
By standing on the weighing machine you can see how much water is in your body.
Approximately 60% of the human body is made up of water.