Have you ever wondered why we bite our nails when we’re anxious? Or wonder why we start mindlessly scrolling our phone when we’re bored? In The Power of Habit, Charles Duhigg introduced us to a habit loop. He described how our circumstances create a cue that triggers us to do certain thing. Doing this will give us something in return: a reward. This reward is what keeps us coming back to our routines. For some people, biting their nails when they’re anxious brings them tempor