The best thing of the science center. It's basically telling you that your body is a conductor by giving you a wicked shock when you put your thumbs on the handles. We had no idea what it was all about until James got shocked and jumped back 3 feet (and then he insisted that I should try it). It's not a little shock but it shook my whole body. I suspected that it would affect ppl with pace maker or ppl who has heart problem. But there was no warning sign to be seen anywhere. Sometimes, safety is not a major concern of these countries...