A 2-part review
I pretty much go to the Science Center about once or twice a year and think this is one of the best places to bring an age-appropriate kid to, maybe 5 and up? I''ve noted that the admission is not cheap but really - Look at the amazing exhibits they have! I would suggest for anyone with kids who can afford it to get the membership and take advantage of these resources and know that your kids brains are getting exercise in a fun way.
Not just for kids, there is always something new to learn in an interesting and interactive way. You can alway check out a laser or Omnimax show for an extra price as well.
I recently went to the new summer exhibit "Bikes: Science on Two Wheels" and found it to be darn cool. They have an interesting selection or bicycles from all over the country ranging from old-timey Penny Farthings to Pee Wee Herman's bicycle. And of course they have to add the science behind them, duh. Interactive stations teach about basic physics principals.
Be warned - your kids will be tempted and want to jump on the bicycles, (there are even 2 Big Wheels!) so keep an eye on them!