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Very interesting

if it has an environnemental-friendly motorisation system (diesther or biodiesel or DIY diesel is NOT environnemental-friendly), for example compressed air.
if it shows to the pedestrians what is detected inside, for example:
- electromagnetic pollution ( wifi, GSM, bluetooth, rfid tags & rfid readers,
- atmospheric pollution and parameters
- connectivity possibilities ( wifi, GSM, wimax, bluetooth, zigbee etc
- GPS coordinates + real time mapping through open source google maps system
if it shows brico alternatives through a mobile show room ( caravan, bus ): Dyne and FLOSS, RePRap &other hardware projects like Freeduino, Open source contents.
if there is a real time report of all of theese parameters (wireless streaming trough a balloon as wireless relay ? or through a "one day latency" ( "one-day-latency-real-time" web diffusion of the parameters) . This latency would be enough to post the data to the streaming website for the next day.
if it organises open-air conferences about bricostuff in the middle of nowhere.

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