The Fernbank museum is only about 1/4 mile from our friend's townhouse, so this was something close and fun to do while they were at work one day. The IMAX theater is a newer style - just a big screen in front of you, not the whole overhead dome like in the older IMAXs. The feeling is the same, but personally I prefer the domes. We saw an interesting but not spectacular show on "The Lost World" - mountains in Southern Venezuela. I enjoyed the show particularly because they didn't mount a camera on the bottom of a plane or helicopter and go zig-zagging all over the place. Most IMAX shows tend to make me motion sick if I don't close my eyes at least a few times.
Aside from the IMAX, the most interesting exhibit for both adults and kids alike is the hands-on "Spectrum of the Senses" exhibit on the top floor. You can play with bubbles, see how optical illusions happen, play with sound and light, and just generally have fun. Unfortunately we got to this exhibit last and didn't get to spend as much time as we would have liked, because we were starving and needed to get to lunch.
We also really enjoyed the exhibit on Syria, which was on the lower level. I think this is where traveling or temporary exhibits are, so I don't think the Syrian exhibit will be there permanently, but it was very interesting. They had copies of Euclidian geometry books transferred into Arabic, and things like wills, annual reports and other documents written in cuneiform. Somehow I forget that cuneiform and heiroglyphics are actually writing, and they had things like wills and business documents written in these funny-looking characters.
The exhibit on the timeline of Georgia is rather interesting, but there are a bit too many stuffed animals and not enough other information. Personally, I'm a photography buff and one of my favorite parts of the whole museum was the black and white photographs that were around the atrium on the main level and upper levels.