In honor of the birthday of the American amateur mathematician and polymath Martin Gardner, a Holiday of Reason was established on October 21 Sobriety of mind and good memory are associated with the activity of neurons in the brain, which must be constantly trained Traditionally, the holiday is celebrated by solving mathematical problems, assembling puzzles, playing Rubik's cubes and solving puzzles Martin Gardner was born back in 1914 in Oklahoma The scientist, who had a master's degree in philosophy, wrote books, essays and articles on entertaining mathematics for various periodicals He is also known as a writer of fantasy stories and the founder of the Paranormal Investigation Committee Gardner served as host of Scientific American's math games and entertainment section, publishing interesting games, magic tricks, mental challenges, and puzzles His essays and articles are distinguished by an intelligible style of presentation, brightness, paradoxicality and novelty of thoughts The scientist is also known as the popularizer of the Soma cube puzzle, flexagons (flexible paper polygons), and the game "Life", invented in 1970 by mathematician D Convoy Gardner died of sound mind and memory at the age of 95 He owed this, not least, to constant brain training The idea to establish the Festival of Reason belongs to the M Gardner Foundation "Meeting 4" In honor of the Festival of Reason, which is celebrated by fans of the scientist and philosopher all over the world, it is customary to solve logical puzzles and solve magical illusions and visual paradoxes At the initiative of the World Psychiatric Association, World Mind Day began to be celebrated in 2015 The holiday, which falls on September 4, promotes mental health and access to medical care for people with mental problems Doctors participating in World Mind Matters Day support social justice in the field of psychiatry and insist on including psychotherapy in university curricula These events have nothing to do with the initiative of the M Gardner Foundation aimed at popularizing mathematics in science However, the Festival of Reason is also a celebration of sober assessments and a rational approach to life On October 21, you can begin to cleanse your mind of bad thoughts and depressing memories Celebration of the Mind Day encourages you to start your life from scratch without waiting for Monday And, of course, stimulate the activity of nerve cells in the brain by solving tricks, puzzles and puzzles