'(Sofia of the Clue Crew reports from the Goodyear Blimp's home base.)  Having learned from the Hindenburg, modern non-rigid airships use helium in place of this explosive gas'
hydrogen
GAS: Having learned from the Hindenburg, modern non-rigid airships use helium in place of this explosive gas
Having learned from the Hindenburg, modern non-rigid airships use helium in place of this explosive gas
Having learned from the Hindenburg, modern non-rigid airships use helium in place of this explosive gas
GAS
hydrogen
GAS