It is an exciting experience to run your fingers over a piece of paper that informs in detail. That’s what blind and visually-impaired people around the world are able to do thanks to Louis Braille, the inventor of the ingenious system used by blind people to read and write. At the age of sixteen (in 1825) he developed a system of characters with six raised dots which can be variously combined to represent the whole alphabet. The invention represented a real breakthrough on the path of knowledge, education, and self-assertion of millions of blind and visually-impaired across the world. Louis Braille...