[laughter] look how cruelly they excluded ununoctium. no wonder he's so unstable!hter] 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 agency is the source of almost half the u.s. helium supply, more than a third of the world's. it's not a renewable resource so once it's gone it's gone. >> stephen: our helium supply is running out! and we have no other source of helium -- other than hunting balloons in the wild. but they're hard to catch, as seen in this classic french nature documentary. and thanks to their natural camouflage abilities, they can disguise themselves as almost any animal: dog, giraffe, or even a snake. no, jimmy, the balloon versions, not the real ones! what? w