The United States of America has a total area of more than 3.8 million square miles. Out of this, 269,717 square miles ...

We see different examples of the materials used to make bridges, including stone, cast iron, brick and steel. Using plastic is a good idea; it is light, easy to build from, doesn’t need cranes ...

We see different examples of the materials used to make bridges, including stone, cast iron, brick and steel. Using plastic is a good idea; it is light, easy to build from, doesn’t need cranes ...

But the two bridges support the load of the roadway in very different ways. The difference lies in how the cables are connected to the towers. In suspension bridges, the cables ride freely across ...