Utility and applicability
of astronomy, physics or mathematics is a subject appropriate
for an extensive and serious article with philosophical implications
- the mere statement that each of these disciplines has
different applications is just a commonplace. Every research in
science contains the implicit question :"What's the use?",
even if the ultimate aim is just to satisfy human curiosity.
Many applications are obvious
and intended. There are, however, those that are unexpected and
unplanned. It sometimes happens that research results turn out
to be useful in some surprising way; sometimes the research itself
may benefit from unforeseen instruments imported from other domains.
We feature such situations
in this issue of WWW Delta. All the texts are intended
to exemplify this very broad area, which we decided to call non-typical
applications. We wanted the panorama presented here to
be like a view from a high Alpine peak on a sunny October morning:
you can't see the entire world, the details are dimmed, but still
the view is surprisingly vast and varied - and maybe the blue
shapes seen on the horizon will become the destination of future
excursions for many a reader.