We need to make sure we can return a single value from history. Also we should check the limit to make sure it isn't a negative number. <img width="959" alt="screen shot 2017-02-21 at 11 26 15 am" src="https://cloud.githubusercontent.com/assets/228734/23173933/c987dcd2-f828-11e6-94e9-2479a05971f7.png">