Capture 4 to 8 flies then place several dabs of glue on an old CD, carefully with tweezers, place the flies on the glue, once you have enough flies launch it (by throwing it) and it will magically continue to fly around for up to an hour,
or perhaps this one.... a little more serious
http://solarcooking.org/newsletters/scrapr05.htm
the lack of fire wood eradication of raw food disease environmental impact of plastics
