The Center of Science and Industry (COSI) is a huge interactive science museum that is fun for all ages. The building is composed of several themed rooms that aim to awe and teach at the same time. Themes including Atlantis and underwater stuff as well as other science like things. Although it is kind of expensive to get in, it is well worth it. I will say it is not as good as the old COSI... probably because they got rid of some of the really cool exhibits like the coal mine etc.
But this place is still pretty neat. You should check it out.
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