In 1998, the U.S. Army tried developing a telepathic ray gun "where words could be transmitted to be heard like the spoken word, except that it could only be heard within a person’s head."
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From @kfacts
In 1998, the U.S. Army tried developing a telepathic ray gun "where words could be transmitted to be heard like the spoken word, except that it could only be heard within a person’s head."