Using a mouse to navigate a computer is certainly convenient, at least it is if you have working arms and hands. For the disabled, however, it's much harder. That's why researchers from the University of Washington have developed a mouse that's controlled via various sounds you can make with your mouth.
So how does it work, exactly? Well, saying "ahh" moves the cursor up and to the right. "Ooo" will send it straight down, while "ohh" sends it down and to the right. To click, make a soft clicking sound. It allows a relatively precise way of controlling the mouse without needing to use your hands at all. And while yes, it might make you sound a little crazy as you control your computer, it's certainly better than not controlling the mouse at all.