4.Depression in pets: Signs, causes, and treatment strategies, AAHA
Another example: why do so many languages implicitly view the right hand as good (for instance, associating the direction right with the ethical concept of rightness) and the left hand as bad, maladroit, sinister?
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You might feel some relief with a fully split keyboard if you find yourself tensing up at the shoulders as you type on a standard board. Putting some distance between your hands may allow your chest to stay more open, which for some is an easier position to maintain. You may also appreciate being able to place your mouse or trackpad between the two halves of the board to minimize the distance your cursor hand needs to travel.