I like breaking the 4th wall(meaning the character talks to the reader directly). It's fun, unique and can convey the character's personality. If the character is a tough-talking gangster who has no time for scientific theories, instead of saying,"So then Dr.Spencer explained how nuclei can divide, causing binary fission and allowing them, and by relation the cells, to surive." he would say,"So then the Doctor rambles off some scientific mumbo jumbo about how cells give birth." Notice that even though cells don't give birth, he says give birth. This can show that he's an idiot when it comes to science. The first example would be more suited to an ambitious college student attending a lecture.