In the amusem­ent park industry, the is king. But during the hot summer months, these classic attractions get some tough competition from inflatable slide. In the past 30 years, the world of slides has exploded. They've transformed from­ simple poolside slopes to intricate attractions that dominate entire parks. According to the World Waterpark Association, there are more than 1,000 water parks in North America, and about 78 million people visited them in the summer of 2006.http://www.hthamusement.com/inflatable-slide/