Parents need to know that the experts featured in this series conduct experiments that would be dangerous for amateurs -- like testing the effect of gas on a plane propeller. Most episodes deal with controversial or mysterious subjects, which can involve mildly scary topics (like the disappearance of ships in the Bermuda Triangle) or violence and war (like the Civil War and the Boston Massacre). The show often refutes commonly held beliefs, so parents might want to be prepared for kids' questions about the show's topics.
Positive messages:Teaches curiosity about the world, including the idea that you shouldn't believe everything you hear. A fun way to think about science in action, too.
Violence & scariness:Brief re-creations of battle scenes, though without blood or gore. Some discussion of death or illness, depending on the episode. Some historical topics are more inherently violent than others, such as references to Adolph Hitler.