Description: This book is a popular description of the unity of the forces of nature for the general reader.At present, all interactions between bodies in nature are through to be ultimately due to the interaction of elementary particles and involve only four types of forces: universal gravitation, or gravitational forces, electromagnetic forces, nuclear forces and the so-called weak interaction.This book describes the principal properties of these four types of force and their "sphere of action", that is, the part they play in diverse natural processes that range from galaxies to the atomic nucleus and the mutual transformations of elementary particles. It includes the latest achievements of physics and gives a picture of the unresolved problems that confront science today.

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