Yeah, go ahead, chew that little calus right at the corner of where your fingernail (hard) meets the tender flesh of your finger (note: tender). Once you get that little piece of dry skin between your teeth, you just have to nip it off. And then typing becomes an experience of self flagellation, as, with every strike of your finger against the keys, the nail digs into the previously well-armored nook left by the now digested calus…