Quick question, I am going to be Gming a session starting with the Damn Dirty Apes mission as its a good mission for…

Quick question, I am going to be Gming a session starting with the Damn Dirty Apes mission as its a good mission for…

Quick question, I am going to be Gming a session starting with the Damn Dirty Apes mission as its a good mission for my setting. But i am a bit concerned as to how my hunters can learn the electro magnetic weakness without me giving it to them somehow. None of them are magic users so theyll either have to make something or find stuff to create the pulses. Any ideas on how they could figure out the weakness via investigation or context clues?