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  • Wildest Weather
  • Tiny Giant
  • Summer Skies

Featured Offerings

Become a COSI Member

Join today for a year of FREE admission!

For less than $10 a month for a basic membership, COSI Members enjoy exclusive discounts, free year-long admission to COSI, and free admission to 350+ science centers worldwide! Join today, and you’ll support COSI’s mission to inspire the scientists, dreamers, and innovators of tomorrow.

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Annual Free Teacher Resource Fair

Tuesday, August 11, 2015, 10am to 2pm

COSI Loves Teachers! Educators will receive free admission to a special resource area, admission to COSI’s classic exhibitions, a chance to see a giant screen film and planetarium show for free, plus fun freebies, door prizes and lots more! Reservations are required. Learn more

From the Calendar

COSI After Dark - a 21+ Event - BOOM! Explosive Science
02 Jul 2015 5:30PM - 10:00PM
Explore the art and science behind your favorite summer fireworks displays. Learn about the explosive forces of fireworks and...
Meet Thor at COSI!
18 Jul 2015 10:00AM - 3:00PM
Visit COSI on Saturday, July 18 or Sunday, July 19 for a special meet and greet with Thor. Free with COSI admission or Member...
Family Friday Night
31 Jul 2015 5:00PM - 9:00PM
COSI offers extended hours and price reduced admission to families so you can visit, learn, and play late! General admissio...