billiam0202, 2 months ago Fun fact: the capstone on the Washington Monument is a nine-inch tall piece of aluminum. It was expensive because it was difficult to refine until the Bayer process was developed two years after it was set.
Fun fact: the capstone on the Washington Monument is a nine-inch tall piece of aluminum. It was expensive because it was difficult to refine until the Bayer process was developed two years after it was set.