When COSI moved from its old location to the building it is currently housed at it garnered a lot of attention and was exciting. Since then the funding has been slashed drastically so the exhibits don't change very often and their hours of operation have shrunk too. Large exhibits that they are lucky enough to reel in cost extra to see above and beyond the regular admission price and a membership doesn't mean a thing either. It's still a nice place to go explore science, but not nearly as good or cheap as the old COSI.
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