Thursday, July 18, 2013

When the Invisible Needs to be Visible

Yesterday I discovered this video about three Norwegian guys who constructed a device that uses light (80 LED lights) and long exposure photography to 'see' the invisible wifi signal fields.  (Shout out to William Stites' blog for this one.)  Their question that prompted this invention was one that we all have; why does the wifi signal vary in intensity from one spot to another?  Their work (two years ago already) revealed the network of wifi signals in our urban landscape.  (Their fab photography is copyrighted so I can't share them on this blog but click here to enjoy them on flickr.)

Later on that same day and over lunch with a friend, our conversation explored the health concerns developing over the effects of wifi signals on the human body.  It would seem that the jury is out on this one according to Health Canada.  If school administrators are worried about the effects of the wifi networks on teachers and students, they should first begin by warning about cell phone use.  (The radio frequency exposure from wifi is less than 1% as compared to a cell phone.)

Wouldn't it be great if teachers had a device that rendered student learning visible?  Wait, I think it's called authentic assessment.  Thoughts for another day.

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