I'm planning on applying to PhD programs in Biomedical Engineering or Materials Science and Engineering with a focus in biomaterials. My undergraduate degree is in Physics with a Mathematics minor, and from what I've been told, the admissions process is different from that of Physics. Some have told me that you really need to build connections before applying to these programs by emailing professors and talking about their research and how you will fit into their group. (Though I don't believe this is the case for all programs, and some frown upon that.) I don't know what to say when emailing them, though. I've emailed graduate advisors with questions about their department, but when it comes to emailing specific professors, I don't know what to say. I don't have any questions to ask the ones who are doing research in areas that I am interested in. Is it acceptable to tell them my research interests and ask if I would be a good fit for their research group? Is it acceptable to email more than one professor at one school? I know some programs have certain rules about emailing professors, so obviously I would check that before emailing them.