users can add the most popular words to their list from the popular words page via a js method. when you click add on the popular words page it sends a post request to new with the word name in params. if that happens, a variable, @chosen_word_name, is defined for the new view and appended to the page in a hidden div. the new page loads a js file called popular.js which looks for that hidden div and puts the word name in the input field.