patrick rogers, even though you may be a horrifying undead creature who rules the night, you turned thes on some real blood suckers and for that, you are a difference maker! [cheers and applause] ♪ ♪ ♪ ♪ grey goose. world's best tasting vodka. [cheers and applause] >> stephen: thank you very much. welcome back, everybody. thank you. [cheers and applause] folks -- [cheers and applause] i've said this quite a few times on this show before so it shouldn't come as any surprise, i'm no fan of periodic table. if you ask me, noble gases are just elitist elements. [laughter] look how cruelly they excluded ununoctium. no wonder he's so unstable! [laughter] but i've always been a fan of helium, because i love lighter-than-air travel. every summer i load the family into the zeppelin and the kids ask: "where are we going, daddy? when will we get there?" and my answer is always the same: "downwind, and eventually." [laughter] sadly, the golden era of dirigibles may soon be ending. >> it appears the clock is ticking on helium, the gas we -- the u.s. helium reserve says it come run in by 2020. the age