From: "Geo" 

"Tony Williams"  wrote in message
news:4399df01$1{at}w3.nls.net...


> We need chamaeleon roofs: dark when the sun's shining, light when it
> isn't. Maybe I could buy a few crates of photo-sensitive sunglasses and
> use them as shingles.

That's great if you live in buffalo and it's January but in a greenhouse
world you probably want to reverse that to keep the heat down.

Geo.

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