Have you ever wished you could travel back in time to the future to see how the world would progress, or back in time to change mistakes you've made, or simply see ancient times? Have you ever heard of black holes? Or wondered how they were formed? Or why scientists call them space monsters? And what happens to those who enter or even get close to them? Are there really theories and equations that say time travel, or going to other universes via black holes, might be possible? Are there types of time machines? What do they look like, what are their features, and how did scientists deduce them in the first place? Have you ever wished you could suddenly disappear? Or exist in two places at the same time? Or somehow travel from the country you live in to America, for example, in a matter of seconds? Or penetrate a wall to the other side without being harmed, or even for the wall to be punctured! You may think that these things and others are impossible and considered myths, but there is a theory called quantum mechanics that studies these matters, and it has found applications on the level of atoms, and there are attempts by scientists to apply it on a larger level. Let us complete the book with many exciting physical theories with an explanation suitable for different ages and specializations from scratch, to learn about the most prominent matters in modern physics that disturb scientists because of their madness and difficulty of believing them despite their confirmation, of course.