The key ingredient in making glass is sand. The other two elements that are critical are sodium carbonate and calcium carbonate. Learn more about the process of making glass on Discovery Channel's "Some Assembly Required."
When impoverished inventor Nikola Tesla died in New York City, the U.S. government confiscated his notes. Why? Were they trying to steal his technology? Did they ever relinquish the notes? Tune in to this episode to find out.