We have a family membership and it is well worth it. I was pretty bummed when the levy failed, it would have been nice if all of Franklin county could go to COSI on a regular basis. Its really cool to see the looks on kids faces when they're learning something new and you see that on a regular basis at COSI. Whenever our nephews and nieces visit we go and they love it. We have a pretty young child who enjoys it as well so you don't have to worry about entertaining smaller kids. It doesn't really compare to science museums I've been to in other cities that have more of an adult component as well, but its great for kids.
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