Other solutions: a telephone that interrupts rather than creates a current when the buttons are pushed, an ink that disappears after three days so that hospitals could overcome the restriction against unnecessary writing (defined as a permanent mark), and a cardboard “house” for coffins so they can be transported on airplanes on which a member of the Kohanim (priests’ caste) is traveling, as they are forbidden from being together in the same room or enclosure.
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