If you decide to enter or not best of luck with your ideas!
This might also work as a genetically modified plant, that acted as a living sensor, switching on similar genes to those that cause color changes during leaf-fall.
Just learned about your blog from The Presurfer. I love it and will be a frequent visitor. Thanks for sharing your creativity.
nice ideas in here. greetings
Funnily enough, nature has a clear case of prior art here…
The leaves of the tobacco plant are generally green, but some varieties develop dark spots in areas of pollution. I remember growing them as a kid as part of a nation-wide acid rain survey 🙂
Spiderwort is known to detect radiation and indicates it by the changing of the flower color.
Thanks, Sunflowers were also used to extract radiation from the soil around chernobyl
Dominic Wilcox 
What a nifty idea 🙂
Loving your genius ideas, at my workyplace we’re doing a competition you may be interested in: http://firebox.com/features/inventor
If you decide to enter or not best of luck with your ideas!
This might also work as a genetically modified plant, that acted as a living sensor, switching on similar genes to those that cause color changes during leaf-fall.
Just learned about your blog from The Presurfer. I love it and will be a frequent visitor. Thanks for sharing your creativity.
nice ideas in here. greetings
Funnily enough, nature has a clear case of prior art here…
The leaves of the tobacco plant are generally green, but some varieties develop dark spots in areas of pollution. I remember growing them as a kid as part of a nation-wide acid rain survey 🙂
Spiderwort is known to detect radiation and indicates it by the changing of the flower color.
Thanks, Sunflowers were also used to extract radiation from the soil around chernobyl