as suggested by erwin…a little on computer ergonomics since all of us are in front of our computers/laptops for long periods of time
Machine Set-up
# Visibility.You must be able to see what you are doing easily to avoid eye strain and neck pain. Have adequate amounts of light. Florescent lights are not very good, the so called “natural spectra” florescent lights are not quite as bad, incandescent lighting is better and indirect natural (sun) light is best. Reduce glare as much as possible, not only on your screen but also on the rest of your work ares including the keyboard. Hoods, drapes, glare screens and changing the lights can do wonders. Use the control knobs on the monitor, they can help you. Don’t be afraid to fiddle around with the tilt and height positions of the monitor. Rearrange things until you can see well and it feels comfortable for you.
# Chairs. As with visibility factors, experiment with chair height and/or tilt. Try different chairs. Keep trying until you get it the way your body likes.
# Keyboards. Be sure to get the height right to prevent too much bend at the wrist and allow the forearm to have some support. The arms should hang loose to prevent the shoulder muscles from cramping. Many keyboards can tilt; unfortunately, most of them tilt the wrong way. If any thing the keyboard should tilt to help the wrist stay straight, which is to say raising the space bar end and lowering the “top”(the F1, F2 etc.) end. Tilting the key board the other way, (space bar lower and “top” row higher) can predispose you to carpel tunnel syndrome.