pi not pie

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Hey, I was a bored kid, and Dean actually played along.

…. For the first twenty pies, anyway.

Happy pi day! 

Unlike us, echinoderms like sea urchins have what is known as radial symmetry – meaning they’re symmetrical around a center point, like a pie. These purple and red sea urchins were observed in Greater Farallones National Marine Sanctuary off the coast of California. 

(Photo: Steve Lonhart/NOAA)