Spanisch

A view of the world where the geographically largest countries also have the largest population. Wenn die geografisch größten Länder der Welt auch die mit den meisten Einwohner wären. Si los estados más grandes tendrían las poblaciones más largas. (c) http://i.imgur.com/c6Agr.jpg

This is an interesting video about interpreting and a good brief explanation of how simultaneous interpretation works and what is required. To be sure, there are a variety of other ways and situations for interpreting, but this is one, if not the most demanding and exhausting form of interpretation. You can find more information on the different forms of interpretation here.