I was at the tyre (tire) shop the other day

The attendant was trying to entice me to change the air of my tires and replace it with Nitrogen!!!!

He tried to baffle me with the science behind it. Of course I didn't fall for it. You would be surprised how much was he trying to rip me off.

I came away thinking a thought

Why pay when air itself is over 78% Nitrogen? Its like this site why pay when you get 78% of it free?

And then I had a brilliant concept

If we were to use Helium gas instead of air in the bubble wrap used in packing parcels would our packages get lighter ? Hence cheaper to send?............. hehehehehehehe