Equipped with a stool and a jug, Tobi tries his luck at milking. But Hilde, Bummerl and the other cows, are not at all in the mood to be milked by the inexperienced Checker. Together with laboratory ...

The Checker then visits a waste sorting plant and looks at sorting machines. He finds out how new things can be made from plastic from our packaging waste. Finally, Tobi even goes to the sea. Here he ...