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.

Fossil Urchin

SciencePosted by Jay Sun, April 22, 2012 19:23:07
Found this today - remarkable flint fossil.

What look like barnacles on the base are symmetrically and evenly positioned around the centre line. The whole thing has 5 fold symmetry, with typical urchin like tracks leading to the point at the top of the dome.

The small panels with raised encrusted edges are particularly attractive, like a Faberge egg.