I need help choosing a science curriculum for 4th grader. I looked at science fusion, k12, and RS4K, but I couldn't decide which one is the best. I am looking for something really thourough and enjoyable at the same time. My DD loves math and science. she really wants to be a scientist or physician. So we really need a good preparation curriculum for her plans. I am not just looking for 4th grade but for a whole path to college. Thank you