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My preference is for MPC, particularly the one bundled with the CCCP (cccp-project.net). MPC works wonderfully for pretty much everything, and what it lacks in interface is more than made up for in features. And the CCCP version is customized to run as smoothly as possible with the codecs it comes with (plus, if there's anyone I trust with getting the most out of my videos, it's the geeks of the anime encoding community behind the CCCP).
I'm not sure how stupid you think kids are, but whether or not they understand HOW large something is, they understand that a world that is 6000 years old couldn't have harbored animals 65 million years ago. It's just a matter of knowing one number is bigger than the other.
Also, feel free to grab a dictionary, and check out subtle differences between "argument" and "example." "Troll" might be a good one too (perhaps webopedia might be more helpful for that one...).