vacuum tube technology still be with us, a billion units strong worldwide...

the microwave oven!

at it's heart be something called a cavity magnetron tube.

always a low-cost means of producing microwaves and thus cooking our tidbits for us.

yes, the cavity magnetron tube...a vacuum tube apparatus.

magnet + electron = magnetron.

http://www.youtube.com/watch?v=U0FU1M5Ohr8

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