ICT Section: Those bumps on the F and J keys

Source: Those bumps on the F and J keys

QUESTION:
On my laptops keyboard (QWERTY) there are some ridges on the F and J buttons, what are they for?
They don't bother me, I'm just interested! they are little ridges towards the bottom of the button, and they interest me :PThanks in advance :)

ANSWER:
Best Answer - Chosen by Asker
People who touch-type (type without looking) use these two ridges to determine the position of their fingers on the keyboard. Touch typists put the index finger of their left hand on F and the index finger of their right hand on J before they type so they know where their fingers are at.

Source: Those bumps on the F and J keys
Copied and Edited from: http://answers.yahoo.com/question/index?qid=20100109154446AAhdKnF

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