The thread title says it all really, have been advised to take dd to see one of these by various friends but I don't really knowwhat they do or what benefit they will be. Can anyone tell me in very short sentences?!It's late!! (On that note sorry if I don't reply but getting disapproving staresfrom dh who thinks I may very shortly have to ask mumsnet whether I should breathe in or out!! may have to log off soon!)