lol, this time it's GPS.
In other obvious news we are over-reliant on:
Petrol - If this runs out there's no long distance transport or ability to make most household goods.
Food - If this gets wiped out by lack of sunlight due to volcanic ash.
Phones - how would we tweet in meetings without them?
The interwebs - probably would have to go out and socialise, which is a long forgotten skill.
Any other obvious research you want me to do, please send funds to my paypal and expect immediate results.
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