Researchers have found they can tell what someone is typing on a computer by the sound of the keystrokes. “Because the sound generated by each keystroke is slightly different, the researchers were able to generate a computer program to decode what was written. Using statistical learning theory, the computer can categorize the sound of each key as it’s struck and develop a good first guess with an accuracy of 60 percent for characters, and 20 percent for words. We then use spelling and grammar check to refine the result, which increased the accuracy to 70 percent and the word accuracy to 50 percent.”