• why put foil on a doorknob when alone

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  • Foil, either on the inside of the doorknob or wrapped around it, can be used as a simple, temporary security measure when alone. This is because it prevents anyone from unlocking the door from the outside, as the mechanism won't turn with the foil in place.

    • Answered:

      Jeffrey Levine

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  • Foil can be used as a low-tech door alarm. The sound of the foil being pulled away will alert you if someone opens the door while you are alone. This is especially helpful if you are home alone, and you want to be alerted if someone is trying to enter your home without permission.

    • Answered:

      Simeon Flynn

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