The roundest number in the world

After a fun adventure in an Amazon city, Marino faces, together with his class, new intellectual challenges, this time related to the most important number among all, zero. Researching the number and exploring its many facets, Marino helps his colleagues to lose their fear of zero, collaborating with the purposes of his teacher Olga. Everything can be done with zero, just like you do with the other numbers, except one thing.