On a stage built like a research lab, Doctor Hahn and her assistant investigate the human body. A detector reveals bones, and they explain what joints do. They examine the heart and circulation, view blood cells under a microscope, and explore questions like why cuts bleed and how digestion works. Experiments make human biology playful for children. Performed by Ulrike Winkelmann and Solveig Frank, directed by Rudolf Schmid, with animation by Sonja Wassermann; 50 minutes.

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