Onstage, they’re a mystery—that’s the point. Few magicians have bewitched, bedazzled and befuddled America—and Las Vegas, in particular—as long as loquacious Penn Jillette and his decidedly un-loquacious partner, the single-monikered Teller.

Want to know how they achieve the seemingly unachievable in the illusionary arts? Not happening, kids. That’s primo-confidential. Other info about the mysterioso magic mavens is not. A few facts about this iconic act:

We fibbed. Teller is not technically single-monikered. He’s actually Raymond Joseph Teller. Just not on the marquee.

Along with ex-partner Weir Chrisemer (who later quit show business), the duo gained notice as a trio in an act called The Asparagus Valley Cultural Society, performing at San Francisco’s Phoenix Theater. Previously, Teller had teamed with Chrisemer for an act called The Othmar Schoeck Society for the Preservation of Weird and Disgusting Music. Marquee assemblers are eternally grateful for their breakup.

How to put this? Well, in 1999, Penn was granted a patent for a hot tub jet he designed to … um … make women feel good—inspired after taking a soak with Debbie Harry.

Teller’s voiceless persona originated when he performed magic at college frat parties, as he discovered that when he shut his trap, frat boys focused more on his magic and less on heckling and throwing beer on him. Would that work with heckled stand-up comics? Probably not.

Among their numerous TV guest appearances, the duo were characters renamed Rebo & Zooty in an episode of TV’s Babylon 5, and in Katy Perry’s 2009 video, “Waking Up in Vegas,” the singer tossed the twosome out of a hotel room.

Often asked about his one red fingernail, Penn wrote on Twitter: “Wear my Dad’s ring and my Mom’s nail polish. Just for remembrance and respect.” Shade? “Jelly Apple Red” by Essie.

Books? “They’ve penned a ton of them, many cheekily titled. Among their joint tomes: Penn & Teller’s Cruel Tricks for Dear Friends, Penn & Teller’s How to Play with Your Food and Penn & Teller’s How to Play in Traffic.

Many honors have been bestowed on the duo, including the 2005 Richard Dawkins Award, honoring those who raise public awareness of atheism. They did not thank God in their acceptance speech.

Though he has called Teller his best friend, Penn has said that the two share few common interests, and that unlike famously volatile partnerships based in intense personal relationships—such as Jerry Lewis and Dean Martin, or John Lennon and Paul McCartney—they benefit professionally from giving each other “space” in their offstage lives. Teller has confirmed that dynamic (yes, Teller actually speaks during interviews).

Proving the previous point, here’s a choice quote from Teller, speaking about not speaking: “People come up to me on the street and make some little joke—like they’ll say, ‘Excuse me, sir, what time is it?’ And I’ll say, you know, ‘5:15,’ and they’ll say, ‘Hey! Made you talk!’ And that’s merely a way of saying, ‘I know your work and I like you.’’’

We’ll give the final word to his chattier partner, as Penn pondered his future: “I intend to do the Penn & Teller show until they pry my cheesy magic wand from my cold dead fingers.” Perhaps not the ideal marketing slogan, but nonetheless … good to hear.

Rio, 9 p.m. Sat.-Wed., $76.84-$97.02 VIP plus tax and fee. 702.777.2782