Adam R.
Yelp
This was a neat little place. While we were visiting from out of town, we were recommended to take the kiddo there by my brother who lives in L.R. to give him something to do during the day.
The place is right by the river downtown, and when you go in, there is a gift shop, a small place with vending machines, and then you get to the action. I think it's about $10/person to get in, and well worth it if you need an afternoon of letting the kids run around and do some "sciency" things. There's all kinds of experiments, etc on the top floor, a really neat air tube thing where the kids can put colored handkerchief looking things in the tubes at the bottom, and air blows them up to the top and shoots them out to be caught.
On the bottom, the neatest thing was a "tornado room" where they simulated an experience as told by the news from tornado in L.R. back in 1999. Next to that is a "do it yourself" experiment room that our son also found pretty neat. They have some animals, snakes, spiders, lizards, etc in the back also, and was actually mildly entertaining for the adults too.
Overall, it was a neat experience and one that was worth the entry fee. We wouldn't make it a habit of going all the time, however, as it is only 2 floors and wouldn't take long for kids to get bored if going in repetition. For a new treat, it was pretty cool though.