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Following the successful mapping of the human genome in April of 2003, gene editing has become possible. Using CRISPR-Cas9, scientists can edit genes in order to prevent and cure once debilitating and lethal diseases and disorders. 

Look at the following video to see how Dr. Neville Sanjana, an assistant professor at New York University, explains CRISPR to five very different audiences: a child, a high schooler, a college student, a graduate student, and an expert in the field. As you watch, notice how Dr. Sanjana shifts ethos, pathos, and logos in ways that are appropriate for his listener. 

Biologist Explains One Concept in 5 Levels of Difficulty – CRISPR | WIRED