Went to the Oregon Museum of Science and Industry (OMSI) with my daughter and her husband and two boys today. Fascinating place, lots of hands-on, and while the boys had been to the Children's version, they had not visited this one.
The big draw was a temporary exhibit of video games, going back to Pong, many of which were lit and playable, a video arcade of the ages, as it were. You name it, they had one, and a lot of the old hardware upon which it had first been played.
How old am I? I remember playing Pong when it first came out.
Oddly enough, the boys got tired of that pretty quick and we moved to the other exhibits.
A couple hours and we were done–a lot of stimuli doing such stuff, wheels and bells and plastic balls in giant blowguns and all manner of things scientific -- big Van de Graf generators, Jacob's Ladders, magnets, stop-motion animation ...
Wears you out in a hurry, chasing the grandsons through the place. But fun.