Like most people,  you have probably been frustrated at some point or another by that elusive fly that you could just not swat.  There have been many attempts over the years to come up with means of alleviating us from this conundrum but none have been that effective.

With a little understanding of their behaviour you can devise a simple strategy for catching flies.  I haven't actually spent much time studying the habits of flies so I can't tell how accurate this is but it is now on my list of things to observe over the next few days.