Are microwave ovens dangerous?

What does the 1 minute accomplish exactly? Does a microwave continue to operate after it's turned off? That would be cool, some kind of machine that generates energy without inputting energy? Better than perpetual motion?
If waiting 1 minute is good, perhaps 10 minutes would be ten times better. :D

To intercept stray microwaves and protect the brain when in the vicinity of a microwave oven one ought to wrap ones head in bacon, but dipping the head into beaten egg yolk would be better still .
 
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