Dear friends, we will help you to understand the maze of concepts, facts and conclusions that constitute one of the most ancient and complex areas of knowledge — fundamental physics. Please do not hesitate to send your questions, those spinning in your head for a long time as well as that appeared when reading the responses to the questions of others. We will try to answer briefly, without referring to the thick textbooks. All questions are distributed throughout several categories, each of which is provided with a historical sketch. For an explanation of some lines, the response can contain a link to another question on a particular theme. Once the response is ready, we’ll put it together with background music and picture into one of the categories, immediately inform you about it and will wait for new questions.