Which lesser-known events can help explain the twentieth century? This chapter explores an era shaped by wars, revolutions, scientific advances, cultural change, and technological transformation. It examines how radio, cinema, aviation, antibiotics, television, and computers changed everyday life, alongside stories of espionage, propaganda, resistance, and accidental discoveries. It also highlights people and communities often excluded from major historical narratives. A journey through the curiosities, contradictions, and decisions that transformed the world in only a few decades and continue to influence how people live, communicate, work, and understand the present.