The Kansas Children's Discovery Center is a wonderful place for kids up to about 9. There are exhibits in one large room, which is great as children can race from one exhibit to the next without losing the parents. There is a baby area as well as a toddler area, a professions area (restaurant, doctor's office, veterinarian, mechanic), hands-on activities explaining mechanics of grain storage, a vacuum tube display where you can put in things like scarves to see them fly, floating ping-pong balls, painting on glass walls, blacklight wall art, and much much more. The outdoor area has balance activities, a huge fort, a bike trail, and a new outdoor water exhibit, among other things.
You'll likely show up budgeting 2 hours for your visit and look at your watch to check the time, only to realize 2 hours have gone by and you haven't done half the things there.