Science can explain many things in the world, so it is so important to have at least a fundamental knowledge of the field. Pupils of the 4th grade are invited to join the mastering of scientific bases with the help of the All-Ukrainian Online School state project. During the lessons, pupils will learn what optical illusions are, discover the properties of sound, and explore light and color. It should be noted that all lessons are complemented by sign language interpretation, so children with hearing loss will also be able to take advantage of the lessons.