Twenty pictures of hands — some of them kind of gross, a few of them somewhat sweet — such is life. 

Hands holding things, hands sustaining injuries, hands showing us things, hands getting stuff done, hands replaced with components so we can tie our laces and brush our teeth, 27 bones per hand, simultaneously extremely vulnerable and very hard-wearing.

Chewing the skin around your fingernails, sometimes without noticing, can be a tough habit to break, it falls under the category of Dematophagia which is a type of body-focused repetitive behavior, onychophagia, specifically, biting your fingernails but sometimes the nails aren't enough.