I stopped using mice, knobs (IBM/Lenovo) and touchpads (built-in or external) probably twenty years ago. A few months into an intense design project I started

I stopped using mice, knobs (IBM/Lenovo) and touchpads (built-in or external) probably twenty years ago. A few months into an intense design project I started to feel burning pain on my wrists. I was working 18 hour days, 7 days a week. Yes, if I was awake I was in front of the computer. This was a hardware and software project and I was doing it all. This meant lots of precise motion at times. Running Solidworks or Altium Designer often meant very accurate tiny movement while pressing down on a button. Horrible stuff for your wrist. I had been exposed to just how bad this could get. I was friends with several people who did visual effects for motion pictures. Same kind of work. They ran 3D workstations for a dozen or more hours per day, every day. One fellow had to have surgery on both wrists due to the damage he caused. His was always in pain after that. I decided I had to deal with the situation. I didn't want to end-up like that. First decision was that mice and touch pads where horrible input devices. I tested everything and concluded that low friction thumb-operated trackballs were the best. Beyond that, the relative angle of the hand to the forearm seemed to have a HUGE effect on causing inflammation, pain and injury. The flatter and more relaxed,the better. In fact, the most relaxed position had my hands drooping over the keyboard and trackball with virtually no tension on the upper tendons. This meant my standard desk had to go. What I needed was a desk with a cavity into which my hands would droop and meet the keyboard or trackball. My forearms had to be fully supported in order to remove pressure from shoulders and posture. I welded together a few iterations of the idea and ended-up with a desk that was just fantastic. I could work on this thing for 16 to 18 hours a day and have no wrist burn whatsoever. Of course, I also implemented regimented breaks and exercises, but the desk, as well as switching to a trackball, made the most difference. I can't help but think this girl did herself huge damage by using the touch-pad for long hours. I particularly dislike touch-pads on laptops (of any make and model) the are in the wrong place and add tension to your tendons precisely where you don't want it. As for Michelle, wow, what an amazing person she must be.