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While using the bootlin materials for an internal training, there are a few improvements I made (at least, I consider them improvments myself). Since you probably don't agree with all of them, I'm making separate PRs for each. Feel free to close the PR if you disagree with the idea.
This PR introduces the concept of question slides. In many cases, it can be assumed that at least some people in the audience already know something about the subject. Asking the audience a question is a good way to make sure that people stay attentive and to engage their brains in a different way than just listening to the trainer.