Hi guys, I have had some confusion as which letters I can use. I am getting two letters of recommendations from research labs. One from a Psychology Lab and the Other from a Neuroscience lab. Do these count as my science based letters? I also have a letter from a hospital volunteer program called CareExtenders, can this be used as a none science letter although its not by a professor at the school? Furthermore I have a letter from the CEO and founder of an international NeuroImaging society for my work as the student leader. Can this letter be used as a none science letter? Thanks for your help.