zakhar polinsky, secondary school number two in the city of mosty named after hero of the soviet union vasily petrovich zhukov, always finishes what he started, and his class teacher. teacher of chemistry and biology elena leonidovna lapinskaya. i just have to introduce one more, but no less important person. this is our scientific expert ekaterina duko, head of the department of methodological support for science and mathematics education at the national institute of education. ekaterina, hello. hello, vasily. hello guys, i wish you a good mood today, an interesting game, quick and correct answers. and good luck to all participants. good afternoon guys, we are glad to see you here on our playground, and before i start asking you have questions, and i really hope you will answer them correctly, i suggest supporting each other, your colleagues, yourself with applause, don’t be shy, right now in the teachers’ room, along with your teachers , is my colleague yulia pertsova, yulia, hello, you word, yes vasya, hello. we are all here and we have mixed feelings, on the one hand we are delight