Thanks Dr. Kevin Ahern. Believe me when I say that I have a teacher who just read his lectures. I think that Biochemistry is a hard subject and difficult to understand because most of the things are just known perfectly reactions and structures. But your lectures have something else. I take some notes and it's easier for me to study the subject. Before I started with Lecturio most of my subjects I didn't know how to study. There is only one thing that I would like to suggest. I would like to know some facilities that teachers and students use for know the structures.