The Exploratorium - San Francisco - Yelp
http://www.yelp.com/biz/0RXDIJ4NhzUNMU2WpUN2XQ?hrid=lXYJQ5UyogEig_6rXoaTRA
"A hands-on museum with dozens of interactive exhibits explaining how and why things work. Even those with little or no interest in science will find themselves fascinated by a lot of the facts and figures told in simple laymen's terms."