Helium is no longer just child's play to create that squeaky voice by inhaling it from balloons. ( and if you are interested, this happens because sound travels faster through a lighter gas than a heavier one. The speed of sound in helium is almost three times faster than in air and this changes the resonant frequency of your throat so that high frequencies sound louder than low ones ). Today, in the context of helium supply disruption due to recent attacks on Qatar's gas com