Why is chocolate wrapped in aluminum foil?

Yesterday, for fun, I wrapped the phone with this foil after the plate, left a hole for the range screen and, in fact, it fell to no range. wow, physics works! joke, but seriously, why wrap a chocolate bar like that!? I mean, it's nice to know that it is resistant to gsm wave penetration, but was it supposed to be that?
Yesterday, for fun, I wrapped the phone with this foil after the plate, left a hole for the range screen and, in fact, it fell to no range. wow, physics works! joke, but seriously, why wrap a chocolate bar like that!? I mean, it's nice to know that it is resistant to gsm wave penetration, but was it supposed to be that?
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