What Problems of Physics and Astrophysics Seem Now to be Especially Important and Interesting?

The science of physics has grown and diversified immensely in recent decades. Numerous new fields in physics have come into existence, such as astrophysics, geophysics, radiophysics, chemical physics, physics of metals, physics of crystals, and biophysics. The diversification has not deprived (perhaps, better to say, has not yet deprived) physics of a certain integrity. I mean by that the unity of fundamentals and the generality of many principles and methods, as well as the bonds between various branches and fields of research. On the other hand, diversification and specialization are increasingly hindering visualization of the structure of physics as a whole and obviously generate a certain disunity.