Very cool pictures of colored smoke - I'm not sure how they were taken, but they're nice. Would make good background images for your desktop.
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On second thought and with more perusal, check out the entire site of sensitivelight.com. The pictures are amazing! I especially love the macro work with hoverflies. I never knew they were so colorful!
The Birds of Prey page is incredible also. The whole site actually - just browse around and have fun on it.
Coolness Factor: 10