Explore COSI, Columbus' dynamic hands-on science center! COSI was named the #1 science center in the country for families by Parents magazine and features 320,000 square feet of hands-on science, 9 themed exhibition areas, Central Ohio’s largest digital movie screen, a 60’ Dome in the Planetarium, a special area for children from birth through first grade, the country's only high-wire unicycle, and live shows. COSI is located in downtown Columbus at 333 West Broad Street. Visit cosi.org or call 614.228.2674.