There are two main types of structures ... a garden fence or something much more complex such as a skyscraper. A shell structure has a thin curved outer layer and is hollow.

There’s another way of making a structure. A shell structure is just made of a thin, curved outer layer and it’s hollow inside. Like this, or this, or this, or this. A shell structure doesn ...

Royal Dutch Shell's structure is pretty complicated. The company is currently registered in the UK, but its headquarters are in the Netherlands. There are two different types of shares ...