MIT's wearable device can 'hear' the words you say in your head
 

If you've read any sort of science fiction, it's likely you've heard about subvocalization, the practice of silently saying words in your head. It's common when we read (though it does slow you down), but it's only recently begun to be used as a way...

https://www.engadget.com/2018/04/06/...-silent-words/