Why Can't Helium Balloons Last Forever?

There is NOTHING sadder in this world than a Helium balloon that's run out of juice. A downbeat puppy? Not as sad. A wet kitty? Not as sad. Because they have the prospect of rejuvenation, a helium balloon past it's sell by is done for.

Why am I talking about helium balloons? Because about 2 weeks ago, we rescued one from a multi-storey car park, and today is the day that it's sorry ass is on the floor :(

It did well, 2 weeks is a lot longer than I ever remember a helium balloon lasting before, but still, it's sad.

So here's to you Reginald! May your balloon afterlife be all that you expected and hoped for. Not yet though, now you don't float properly I can play keepy uppy without cheating...