Free Flight SportBy Don DeLoach | dad72@gmail.com FOR MUCH OF human history, glue was available only to a small percentage of the population (nobles, woodworkers, etc.). The earliest known adhesives came from the bark of birch trees and were used in prehistoric times 200,000 years ago. The more common "animal hide" glue was first introduced in ancient Egypt approximately 4,000 years ago.The most popular uses of glue, which was very expensive and rare at that time, were reinforcing the durability of papyrus scrolls and creating furniture. Several examples of such furniture were preserved…