What is Concrete?
After Water, It's the most widely used material on our planet. Ton for ton, says this article from Gizmodo, concrete is used by humans more than steel, wood, plastics, and aluminum combined. The supply and use of concrete is a $100,000,000,000 industry. What is amazing is that most people don't really understand what concrete really is. This post explains the volcanic origins of concrete, how it was prevalent in the ancient world and then forgotten, and how it's rediscovery and evolution is doing more to shape our physical world than any other material on Earth.
Here is an excerpt from the post: