Ever wondered why only 'F' and 'J' have bumps on the keyboard; the reason is surprisingly smart

Tiny raised lines on the F and J keys, known as tactile markers, serve as crucial landmarks for touch typists. Patented in ...
Indiatimes

Ever wondered about the tiny bumps on F and J keys? The hidden typing trick revealed

Keyboards have small bumps on the F and J keys. These help people type without looking. The bumps guide fingers to the right spot. This makes typing faster and more accurate. June E. Botich patented ...