One of the most incredible developments the past few years is how technology is making it easier for people to interact with the rest of the world. If you need help seeing, you can have laser surgery. If you can't hear, there are hearing aids and implants that will help.
If you can't move, or know someone who has difficulty getting around, there are advanced technologies like exoskeletons to help people walk. Or, if you just have a tough time moving a computer mouse, there's technology to help with that.
One free and easy-to-use program for that is called Animouse. It was developed by a young man who wants to help disabled people to communicate better.
Animouse uses your computer's webcam and facial-recognition software to find your face. It automatically finds tracking points on your face.
Once Animouse finds you, it will move your computer's cursor in the same direction that your head is moving. Left, left; right, right.
Note: Animouse is completely free, and it's open-source. Meaning, if another programmer wants to improve on it, they can. It works only on Windows computers.