4 ideas
Yearimdang's 'Why?' series is a hundred-volume set of Korean educational comics in which the same child characters explore a different science topic in each volume through illustrated adventures, and it has sold roughly 86 million copies. It is a documented case of comics being used as a mass-market vehicle for children's science education.
The series keeps the same child characters throughout while changing the science subject in each volume. Readers who already know the characters come back for unfamiliar topics, so attachment to the characters does the work of pulling them into new material. Continuity in the narrative lowers the cost of starting each new subject.
Having a specialist check each volume catches factual errors, but it does not make the volumes equally good as teaching. Some volumes come out stronger than others even under the same review process. Whether a volume works depends on whether its topic suits the format, and accuracy alone does not determine that.
The strongest volumes cover physics and the human body. In those subjects, forces, motion, and organs can be drawn directly and acted out by characters inside the story. This suggests asking of any subject whether its core ideas can be shown as visible action, because that is where illustrated narrative teaches best.