It's never about me, but I've had a question for many years now: Considering the exquisiteness of a round tube, open on both ends, and the behavior of a colloid under pulsatile flow through it... (here it comes): Is there anything identical to it in the inorganic world? Crystalline, decayed, extraterrestrial, etc? Not a cave; something uniformly round, open on both ends.
I gotta be missing something. Often do. Thanks for higher thoughts.
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