What if the first attempt at instant messaging involved telepathic snails instead of electricity? In this episode of What You Didn’t Hear, we explore the bizarre true story of the Pasilalinic-Sympathetic Compass — a 19th-century communication device created by French inventor and occult experimenter Jacques-Toussaint Benoît. Long before radio, Wi-Fi, or the internet, Benoît believed mated snails could transmit messages across any distance through an invisible sympathetic bond.

Dive into the strange intersection of Enlightenment science, mysticism, animal magnetism, alchemy, and early communication technology as we uncover one of history’s weirdest forgotten inventions. From snail-powered “wireless texting” to public demonstrations in Paris, this episode breaks down how Benoît’s bizarre machine was supposed to work, why some  ...