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The brain is a powerful war machine that uses not only atoms, molecules, cells and organs that work together in harmony, but also pleasant or unpleasant experiences and emotions that, accumulated over time and in the tissues like indelible scars, are remembered so that they can be retraced or carefully avoided. A journey that will take us from the roots of the tree of biological life through the ramifications of the brain cells to reach the brain functions, from the cellular microcosm to the social macrocosm through social networks and neural networks.