Han Sen agreed to provide Su Mianhua some materials so he could continue his research. But aside from the man sharing the results of his efforts, Han Sen wanted lessons on genes, as well.
Those lessons started right away, and Han Sen was able to grasp the basics fairly quickly. But anything beyond that threw his mind for a loop.
Fortunately, a good memory was one of Han Sen's strongest assets. Most of the information he learned was in text, and that helped a good deal.
Han Sen wasn't planning on being a scientist or anything, he just thought such knowledge might benefit him in the future. And as such, he didn't have to study the really complex stuff. He just wanted a rundown of the basics.