Core Viewpoint - The article discusses the historical significance of fire in human civilization, particularly focusing on its role in metallurgy and the production of iron and bronze tools, which have shaped various aspects of culture and technology [1][2]. Group 1: Historical Development of Fire Usage - The program "National Treasure Appreciation" explores the evolution of fire usage from primitive fire-making techniques to advanced iron smelting processes [2]. - The transition from bronze to iron tools marked a significant shift in civilization, with iron proving to be more durable and effective for weaponry [2][4]. Group 2: Metallurgical Innovations - Innovations in blast furnace technology increased temperatures above 1000 degrees Celsius, allowing for the creation of high-quality iron through meticulous processes [4]. - Artifacts such as the gold-inlaid iron sword from the tomb of Liu Sheng and the "Thirty Refined Great Sword" from a Han tomb exemplify the advanced metallurgical techniques of the time, showcasing the rigorous craftsmanship involved in iron production [4][6]. Group 3: Impact on Military and Culture - The development of iron weapons laid the foundation for military advancements, with designs like the ring-handled sword enhancing combat effectiveness for cavalry [6]. - The mastery of ironworking positioned China as a leader in the global iron industry during the Tang dynasty, reflecting the cultural and technological prowess of the era [6].