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Trackballs are good, I love my logitech marble. Don't love all the shit logitech installs with it (100 mb for mouse drivers? Are you kidding me?) but whaddaya gonna do.
The damage does heal but it takes a long time, just like it's years to pile up, it's years for it to go away, and you have to keep using the computer all the time so if you're adding more wear and tear you'll never get better.
The carpal tunnel is in the wrist, a small tube where the nerves and tendons go through, if you put pressure on the hand while moving it they rub raw (Simplified explanation)
I also use the program from rsiguard.com it has a lot of features to help with rsi
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