At the time of ancient Greeks, it was believed that all matter in the Universe was made up of four basic elements - earth, air, water and fire. Furthermore, it was also believed that matter was continuous , that is, one could divide a piece of matter into smaller and smaller bits without any limit: one never came up against a grain of matter that could not be divided further. However, some Greeks, such as Democritus, believed that all the matter was made up of small particles, which could not be further divided, and these tiny particles were called atoms. (The word atom means “indivisible” in Greek.) However, our understanding of nature have been changed by years of research and now we have a better explanation of how our Universe works. There are four fundamental forces which dominate the Universe and on the basis of these forces the Universe works. Here is a brief explanation of these forces. Gravitational Force The gravity is the weakest of all the forces. It is a universal fo
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