one in the city of sludsk, active, inquisitive and smart, and his cool supervisor, biology teacher, ninanovna, chernous. polina tretyak, secondary school number 5, veneyki, beautiful, smart and kind, biology and geography teacher anastasia sergeevna. roman sopot, secondary school number 138 in minsk, modest, purposeful and dreamy, and his class teacher, geography teacher olga olegovna mashonskaya. roman karpenya, secondary school number 32 in minsk, a creative, smart guy, and his primary school teacher svetlana ivanovna kesel. i just have one more person to introduce, this is our scientific expert, ekaterina duko, head of the department of methodological support for natural and mathematical education of the national institute of education. in case of controversial situations, it is she who will decide whose side is right. hello, hello, vasya, hello, guys, today i wish you only positive emotions, interesting questions, quick and correct answers , good luck to all participants. hello guys, we are glad to welcome you to our playground . and before the game begins, before i start asking you