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If this is cheaper than RFID tags, I'm seriously considering starting a company around selling a fridge device that could keep track of food that had a tag printed on them.

The Jetsons fridge that has always been promised, but never made. A fridge that could buy your food for you!

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I think it was never made because it's useless. I know perfectly what's in my fridge. The problem is in deciding what's still edible and then maybe go for some grocery shopping.

Then explain why you keep opening it, wasting energy, to look for some nonexistent goodies.

For the same reason I keep opening Hacker News :)

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