I have been offered the chance to work on a research project with one of my professors. He said he is certain the project will be published. He said I could be the second author if I committ to working at least 15 hours a week in his lab. Do you think this is worth all the effort ? It is an immuno project which is my fav subject but 15 hours a week is a lot of time. Also, is there any real difference between being the first author, second author and third author ?