The scientist and inventor Yuri Yemelyanov was forced to master the epistolary genre. He approached the Soviet authorities with a proposal to introduce a device that could dramatically improve the ecology of large cities. Today, this dream is becoming a reality thanks to his unique invention, an ozonator that purifies the air from exhaust fumes and harmful substances. In the USSR, Yemelyanov was ignored, but in Japan and the United States, he was welcomed and offered a laboratory and pilot production. What decision will the scientist make?