<p>OP, if your primary interest is energy research, you can do this from the perspective of a number of basic and applied disciplines, as another poster noted. (If I correctly understand your list of interests, I would lump #1 and #3 together.) Some possible undergraduate majors for your interest in new forms of energy: Physics, chemistry, plant sciences, biological/agricultural engineering, nanotechnology, optical science/engineering, and earth sciences. If you are interested in improving existing energy technologies, you can add nuclear engineering, materials science, electrical engineering, chemical engineering, mechanical engineering, and probably some others. There also are an increasing number of interdisciplinary programs in energy engineering. At the graduate level, you also can add programs in applied physics. Its probably premature to try to lay out your whole progression from bachelors to masters to doctoral degree. Your interests or focus likely will change in several ways before you complete your education, and as long as you have a solid grounding in core math and science disciplines, you usually can enter disciplines that you did not necessarily study at a lower level. In fact, as another poster also noted, innovations often come about at the intersection of disciplines.</p>
<p>For your interest in the immune system, several majors could provide appropriate preparation at the undergraduate level. These would include general biology, and the various subspecialty bioscience concentrations, such as molecular biology, cell & developmental biology, biochemistry, genetics, microbiology, and chemistry. These disciplines would be appropriate at the graduate level, too, but add other specialties not typically available at the undergraduate level, including immunology, and pharmacology. You can pursue a research pathway or a clinical pathway. For the latter, you might want to consider an MD degree or a joint MD/PhD program.</p>
<p>For your particular interest in the brain, appropriate undergraduate majors include biology, psychology, or neuroscience (also available as a subspecialty track within many biology and psychology depts.). The same fields would be appropriate at the graduate level. You can pursue a research pathway or a clinical pathway. For the latter, you might want to consider an MD degree or a joint MD/PhD program. As a researcher or clinician, you can pursue subspecialty training in developmental disabilities.</p>
<p>Energy, immunology, and brain science are quite separate disciplines, and, I believe, youll probably have to choose one of these to focus your interests. You might be able to put this off until you decide on a specific graduate pathway, but ultimately, it will be difficult to do research on the side in the fields not chosen as your primary interest.</p>
<p>As for minors, you can choose any of the fields mentioned under each of your interests. For your energy interest, you also could consider an area like environmental economics & policy since understanding the impact of those factors is as important as understanding the science and technology in terms of adoption of new technologies. In that respect, you also could consider a business degree (e.g., an MBA), focused on a relevant area such as entrepreneurship or technology management.</p>