I've always wondered why our world, and those air-filled packaging pads and bubble wrap, aren't filled with helium. I know there's a risk to stationery suppliers - the Mary Poppins effect - but the idea of shaving Kg off the weight of airfreight packages is surely appealing. Hydrogen fuel cell cars, however, remind me of the Hindenburg... Tesla wins on that count.
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/s
I wonder why they "grated" the patent?
They thought it was cheesy.