The grooves of the keyboard on the ‘F’ and the ‘J’ keys are meant to improve your speed and accuracy, indicating where you should rest your fingers.
The idea is, that when you begin to type something, your fingers will naturally move to the ‘F’ and ‘J’ keys, putting you in the optimal position to type.
The innovation was made by June E. Botch, who single-handedly made our typing more efficient without most people even realizing it.
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