Talk:Telepathy/@comment-38876330-20190706021852/@comment-34962159-20190706095634

Reading the page, it seems that telepathy doesn't actually send sound waves but some sort of supernatural signal. The acoustic tube is merely used as an example. Presumably, the non-telepathic person can still send signals by thinking, they just can't make or break the telepathic "wire".

That's acknowledged here: "According to Touma, the research on telepathy is still ongoing, and due to the prevalence of handphones, has slowly become obsolete."