London without the Tube? New York without its underground scene? Atlantans gliding straight from their MARTA stops to the airport? What would life be like without our underground transportation system?
While traveling along the Interstate, you may have noticed that truck weigh stations occasionally dot the highway. What are these weigh stations for, and how do they measure the weight of a truck? Find out the answer in this article.
We are a species of bridge builders. Since time out of mind, humans have engineered structures to vault over obstacles with the help of logs, stone, steel and, of course, ingenuity. So, what keeps our bridges steadfast and strong?