Isn't this what it means to elegantly explain string theory, a cutting-edge theory in physics?
Author Brian Greene perfectly digests the mysteries of string theory in one book.
This book explains cutting-edge theoretical physics, known for being the most difficult, using simple and clear language rather than grandiose expressions. Through this book, you will be able to see and feel the profound principles of the universe up close.

The surface of granite is very rough and uneven on a microscopic scale, but our palms cannot detect variations in such small areas, so it feels smooth.
In other words, microscopic variations are completely ignored by the 'macroscopic palmar dullness'.
Similarly, strings also have a finite size in space, so it is impossible to obtain information from a smaller area.
That is, the structure of a region smaller than the Planck length cannot be explored using a string.
Like a palm resting on a granite surface, the string cannot detect the fluctuations of the gravitational field occurring in the ultra-fine domain.
Quantum fluctuations in the gravitational field are clearly a phenomenon that exists, but since there is no way in principle to verify them, there is no need to worry about the discrepancy between general relativity and quantum mechanics.
No, that wasn't a problem at all in the first place.
Moreover, the troublesome 'infinity' problem that has always arisen from point particles when understanding gravity from a quantum mechanical perspective has been neatly solved with the advent of string theory.

--- pp.242-243