Apple MacBook (13-inch, Late 2006) - Manual (Page 61)

Chapter 5 Last, but Not Least 61
Understanding Ergonomics
Here are some tips for setting up a healthy work environment.
Keyboard and Trackpad
When you use the keyboard and trackpad, your shoulders should be relaxed. Your
upper arm and forearm should form an angle that is slightly greater than a right angle,
with your wrist and hand in roughly a straight line.
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