The document discusses the history of nanocomposites and their development. It notes that ancient civilizations used natural composites like straw to strengthen building materials. In the 1930s, synthetic composites like fiberglass and resins were developed and played an important role in applications during World War II due to their strength and lightweight properties. The war efforts led to many commercial products made of fiber-reinforced polymers. The document states that both natural and synthetic composites were revolutionized in the 20th century.