In general, audiences are willing to do quite a bit of work to figure out what the story is and where you're going with it—that's part of what makes viewing a good documentary an active rather than passive experience—but eventually, if they become too lost, they'll give up. A good storyteller anticipates the audience's confusion and meets it in subtle and creative ways, skillfully weaving information in where and when it's needed and not before. It may take some effort to bring a general audience up to speed on what those gadgets actually do or how certain laws of physics work. But armed with that information and an understanding of how it furthers or frustrates the efforts of the protagonist to reach a goal, solve a mystery, unlock a secret, or prove a theorem, the audience can be one step ahead of the story. Those moments when the audience "gets it" just before you, as the storyteller, give it to them, are enormously satisfying.
Just as you want to present information at the moment it's most needed, you also want to be careful not to clutter a story with too much detail. Many film stories get diluted by details that the filmmakers are convinced are "important," although they are not directly relevant to the story at hand. If you're telling the story about a candidate's political campaign, for example, you might not want to spend a lot of time looking at his business career. If there's something about his career that he's promoting on the campaign trail—he wants to bring his cost-cutting strategies to the job of managing a state budget, for example—then it might be relevant. Otherwise, it's taking up space that you need for your story.
Be careful, though, that you don't "cherry pick" your information, selectively using only those details that support your argument or "take" on a story and ignoring those that contradict you. It's possible to be factually accurate and still create an overall story that is fundamentally dishonest. Choosing some details from a person's life as a means of focusing a story is not the same thing as selectively leaving out information you don't want the audience to know. Ultimately you'll be found out, and it weakens your film and credibility.
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