Collection of interesting natural things

I took the picture above to see if I could get a good shot of the ocelli - three secondary eyes between the big ones. They are just about visible. Why spanning tree? It's a routing term, from each user's perspective the network looks like a spanning tree - with no loops and only one route to any place. Every user's spanning tree is unique.

More urchinary

SciencePosted by Jay Mon, May 21, 2012 13:27:22
Here's another fossil urchin I found yesterday. It is embedded in a flint matrix - I chipped off a corner and the flint is continuous through the fossil.

Fill in only if you are not real

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