It is both edifying and highly interesting the way that some lessons can wend their way through a seemingly myriad avenues of discussion. Take for instance a group of guys who are interested in technology. So with this in mind I chose an article about nanotechnology, and with handouts in hand, sortied into a subject which opened the door to a fascinating conversation.
A great thing about my work is that I am always learning something new, take for  instance that liquid can contain nanotechnology, and that minute nanotechnological factories can build and replicate themselves,seemingly until the end of time. The concept arose that they could actually act act a cellular level and develop a form of collective intelligence, and thus they would ultimately supplant us from our position at the pinnacle of the current foodchain. This in turn gave way to the notion that we do not live according to a sustainable societal system, and that in fact our parasitical existence on our planet must and most probably will be superceded by a system or entity spawned by our very own technology. This then moved into the area of intelligence, and then onto policemen, but that is another subject for another day:)