The heroine of the story is a teenage Jitka Pažoutová, suffering from her fatness and clumsiness. For her, the real torture is especially the gym classes led by a sympathetic gym teacher, nicknamed Bohoušek by the girls. A change for the better is a dodgeball match, which the girls win thanks to Jitka's "guns", which simply cannot be caught. At the tournament, Jitka meets Honza Koubek - a boy who insults her, but then apologizes to her and persuades her to try using her strength in the shot put...

This tale is about young Ludvik (Robert Nespor) an erstwhile, budding scientist whose practical sense leads him to experiment before his common sense has figured out the results. Due to that unfortunate pattern, he variously floods the bathroom while working on displacement of volume and weight in water, he shatters the harvest pumpkins but not the law of gravity, and now he is eyeing the neighbor's rabbits for an electricity experiment. While the rabbits remain safe for awhile, Ludvik's parents wish he would follow in their more traditional footsteps and dedicate himself to music. Instead, Ludvik has learned that the proper mixture of a certain carbide and water can be explosive, and while he works on that technique, a friend tips off the physics teacher about these potentially disastrous plans.

Adventures of a little Czech girl Yana visiting in Moscow with her parents and dog.

A group of boys are spending summer riding their bikes across the city but suddenly they are forced to fight a group of thieves.