On December 20, the fourth season of the "Know? Teach!" contest began in Russia. This contest allows schoolchildren to present themselves as future young scientists, showcase their talent for science popularization, and demonstrate their projects and ideas. Winners will be awarded exciting trips, technology, and certificates for educational courses. For the first time, schoolchildren from Belarus will participate in the contest. The All-Russian Science Popularization Video Contest "Know? Teach!" is being held for the fourth time, and its popularity is growing. Participation allows talented students aged 6 to 18 not only to gain new experience and meet like-minded peers but also to grow in the scientific field. To participate, contestants need to create a three-minute science popularization video and publish it on the Atomarium platform. "The All-Russian 'Know? Teach!' contest is a key project of the Decade of Science and Technology, announced by President Vladimir Putin. Last season, more than eight thousand schoolchildren took part, reflecting the younger generation's growing interest in science. According to recent data from VTsIOM, one in three parents wishes their children to pursue a career in future technologies. All the necessary conditions are being created for this. For example, under the national project 'Science and Universities,' 940 youth laboratories have been opened, modern campuses are being built, and 50 advanced engineering schools have been established in 23 regions. By 2030, this number is expected to increase to 100. This effort will continue under the new national project, 'Youth and Children,'" said Russian Deputy Prime Minister Dmitry Chernyshenko. Over three seasons, more than 15,000 schoolchildren have participated in the contest, and about 75,000 materials about the project have been published on various informational platforms. Given the growing popularity and interest from children, it was decided to extend the contest for a fourth season. The first stage—submission of entries—began on December 20, 2024. Young researchers can submit their videos in five thematic categories supported by partners such as the State Atomic Energy Corporation "Rosatom," PJSC "Sibur Holding," the State Corporation "Roscosmos," PJSC "United Aircraft Corporation," and LLC "PSK Pharma." The categories are linked to school subjects, allowing participants to choose those that best match their interests. Additional categories for selecting the best school and mentor remain available. Their partners include the publishing house "Nauka" and the educational platform "Sferum." This year, the contest expands internationally: in the "Electromobility" category, supported by "Rosatom," schoolchildren from Belarus will participate for the first time. Traditionally, the "Know? Teach!" contest gathers talented youth from all regions of Russia, and Belarus's participation highlights the importance of collaboration and exchange of experience between countries. Thanks to the "Electromobility" category, the contest becomes more diverse and exciting, enabling students to compare approaches to studying scientific phenomena. Prizes in each of the five categories will be awarded across three age groups: elementary, middle, and high school. Thus, 15 winners will be selected in the thematic categories across the three age groups, out of 45 finalists. Winners will be chosen by a jury composed of scientists, business representatives, and creators of popular science content. The awards ceremony will take place in 2025. The authors of the best videos will receive valuable prizes from the contest's partners, including electric scooters, study-related gadgets, tours of unique technological enterprises, and exclusive scientific literature. Representatives of the region leading the additional "Regions Marathon" category will also be invited to the ceremony. The All-Russian "Know? Teach!" contest is organized by ANO "National Priorities" in collaboration with the science popularization platform "Atomarium," supported by "Rosatom," and is part of the "Science to Win" initiative of the Decade of Science and Technology.