The Museum of Science and Industry is one of the most awesome musuems I've had the pleasure of visitng. The exhbits are very hands-on and interactive. I was particuarly impressed by the railroad model of Chicago (complete with the El) and the periodic table that had products representing each element. Very cool. I was there at the time of the Bodyworlds Exhibit and they seemed to be very well-organized for it. Go early in the day - the lines much later were quite scary as we were leaving! The UBoat exhibit is worth checking out - we couldn't afford to pay to go in it but you can go through most of the U-boat related things without paying to go in the boat.