Earlier this week a New York Times article claimed that NSA whistleblower Edward Snowden asked a group of lawyers visiting him to put their cell phones in the refrigerator—the idea being that it would act as a Faraday cage. But does it actually work?
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A microwave oven actually has a faraday cage inside of it. This is needed to prevent the electromagnetic waves used to heat up the food inside from leaking out of the oven. If I were snowden, and I didn't have a cocktail shaker, I'd use a microwave.