For those of you who have to touch – just have to – San Francisco’s Exploratorium is a must-experience educational hot spot. Upon entering the cavernous space reminiscent of a large train terminal, one is greeted with hundreds of learning stations and interactive exhibits cleverly organized by topic: electricity, sound, and many, many more that we lacked the time to see (we recommend committing at least half the day, or making two or more visits to the Exploratorium in order to take in the full experience).