Hier ein schon etwas älteres Erklärbär-Video For children and the thing has what it takes, to become a classic. The story of Willy, the little sperm. Willy is not so good at math, but can swim well. Lief so in KiKa and also in the program with the mouse…

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KiKa erklärt wie Kinder entstehen (Wohin will Willi)