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5. Why are there bumps on the F and J keys on a keyboard?

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via/HowNews

In 10 finger typing, the ‘F’ and ‘J’ keys are the home keys, this is where your index fingers rest. This helps users correctly position their left and right hands without having to look at the keyboard.

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image source

So without looking you should be able to feel the correct position of your index finger on the ‘F’ and the right index finger on the ‘J’ by locating the small bumps on these two keys. This means you should be able to locate the remainder of the keys on the keyboard.

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