'Harmful Advice-1' is the first book in the renowned Grigory Oster series, illustrated by A. Martynov. These provocative poems have long since become a unique genre in their own right: adults and children can look at themselves from a different perspective, have a hearty laugh, and better understand each other. All illustrations were drawn by A. Martynov, whose sense of humor and creative approach to 'Harmful Advice' have earned him a cult following among readers. Designed for middle school age.