Human: What is a good way to keep a child's attention during a long lecture? Assistant: 
A good way to keep a child's attention during a long lecture is to engage them with activities that are related to the topic of discussion. For example, if you're talking about the history of World War II, you could have a scavenger hunt in the classroom or bring in some artifacts from the war. You can also incorporate interactive elements such as quizzes and polls so that children can participate and stay engaged.