d. quarkov, and uh, electrons were still particles and their copies, the so-called other generations.e strangely present, in principle, but do not live. well, because they decay into other particles, how could you here you could somehow informally comment on them what for in this universe in an amazing way uh let me i'll move on to the next slide, because the next slide is just. eh why? again the standard model is a remarkably good theory because it satisfies a very important principle of aristotle who said that the theory is. well, rather, he spoke about a thing that in nature does not create anything in nature. just like that, if something is created, it is needed for something. and we really see with you what you noticed, that we have, uh, particles of matter duplicated and two other generations. seems to be absolutely unnecessary. generation, emphasize. this is a purely technical name. and they said, yes, just, well, just duplicates of, uh, quarks that protons and electrons are made of. yeah, they exist and for a very long time people understood that they were not needed, they wer