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For all you Ortho fans out there.

In this installment of "Wild Card", telescope designer Rick Shaffer gets out his slide-rule and takes you through the arcane world of "P2V", "RMS", and how they relate to the "Strehl Ratio", the new "Gold Standard" for describing an optic's performance in imaging a star.

Instead of a story about a practical joke, Rick Shaffer makes some serious suggestions about how we ought to be thinking about SETI, CETI, and rocks falling from the sky. Just for a little variety, there's more about the exit pupil, plus some "shameless commerce"!

In this edition of his column, Rick Shaffer takes you to a corn field in Ohio. And, the reference to a "Big Ear" doesn't refer to prize winning ear of corn!

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