Discovery of Rubber
When Westerners first landed in America they saw the native Americans playing with a strange white ball taken from a tree. The ball bounces and this made them amused. They later found it also capable of erasing pencil marks. There are two types of rubbers namely the 1) Natural Rubber and the 2) Synthetic Rubber. The second one is made by natural rubber + petroliem products and this is used as the automobile tires. Once upon a time in America, there was a law that restricts the cars, cycles and bikes to drive less than 35 miles per hour. This was to control the damage done to the tires.