I'm new here on SDN, and I keep reading that to get into top 20 schools you definitely need to have done undergraduate research. Are there any top 20 schools that you are more likely to get into despite not doing research? Also, I understand that extensive clinical/leadership extra-curriculars can substitute for lack of research. What kinds of extra-curriculars specifically fall into this category. Would president of a club, TA of a class, or internship at a hospital count? Also, if you do research, does it have to be bio research? Is chem research acceptable? psych research?