I once said to students: “What do you think it’s like to walk around the city and see on every rooftop something you once imagined?” They became thoughtful. Without sinning too much against the truth, we can say about any thing: this is physics. But most often we do not see signs of those sciences that became the basis for the process of creation or the process of functioning of the next gadget. As Arthur C. Clarke put it, all advanced technology is indistinguishable from magic. Sometimes this happens because the appearance is familiar and ordinary, but we don’t think about what’s inside the box on wheels - the whole civilization, from computers to the cracking column. Box and box, front...