It's $25 for adults and $20 for children. Anyone 13 or over is an adult. COSI is open from 10am to 7pm
10 to 7 are holiday special hours. On the last Friday of each month the hours are 10-9, and on New Year's Eve general admission ends at 5 pm. On Sunday 1/7 hours go back to the regular 10 to 5; closed Mondays and Tuesdays.
There are also membership packages available for considerable savings and can be used for reciprocal admission at many other museums
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