Parents need to know that this educational series tackles some weighty, potentially scary topics. In an episode on diamonds, for example, "conflict diamonds" and the current African civil wars were mentioned, while another episode focused on sharks. Parents might want to preview episodes to make sure that the topics are OK for their kids.
Positive messages:Reinforces the idea that learning doesn't have to be boring.
Violence & scariness:Occasional references to/images of "true life" violence -- such as sharks searching for prey or civil war.