How much would you pay for the secrets behind the Mirage’s volcano eruption or an insider’s look at Siegfried & Roy’s Secret Garden & Dolphin Habitat? How much is a tour behind the scenes at the Adventuredome, the Bellagio’s fountain show or the Shark Reef worth? These and many other venues in town are set to invite the curious in free as part of the Las Vegas Science & Technology Festival, set for April 24 through May 2.