The human brain is the most complex object known in the universe. It is said that there are as many stars in the milky way, as there are neurons in the brain. Interestingly, the parallel between the universe and the brain goes further, as the matter density distribution in the universe would resemble that in the brain, no less. This book summarizes the current knowledge on the brain, extending this knowledge into philosophical considerations. It first retraces historical milestones in the discovery of the brain, followed by a detailed and balanced account on current knowledge on the subject. Admittedly, the goal here is to summarize intelligibly the knowledge on the subject without going too much into details. The next step in this odyssey is then to consider more philosophical implications on the brain; hence we will discuss one of the greatest mysteries of all, the consciousness. The last chapter will draw the line between the biological brain and AI, which, we will see, have strictly nothing in common. Finally, we will study the impacts of digital technologies on our brains. This is the perfect guide to familiarise yourself with the marvel within your head, your brain.
