History of Materials and Events Occurring Simultaneously

The timeline below shows the history of materials on the left side; I added a column on the right to show events, discoveries, and periods in time that were happening simultaneously. Although the timeline spans for too much time to discuss all of it, there are certain trends that it shows. One trend that is obvious from the timeline is that growth on earth is occurring exponentially. Very little development occurred prior to 0 BC, but it greatly increased in the 1700s.  It is also clear that the development of materials is heavily affected by events happening around the world. For example, during periods of great innovation such as the Renaissance and the Industrial Revolution, many new materials were discovered. During difficult times, such as the Fall of the Western Roman Empire and the Crusades, very few materials were discovered.