What about learning a sense of scale, for both time and space?

planets and stars

replies to most common comments to the previous video

sub-atomic to hypothetical multi-universes-- uses pictures and numbers, no zooming. I hadn't realized how much overlap there is in size between the larger moons and smaller planets, and (in spite of having seen many pictures) hadn't registered that nebulas are much bigger than stars.

I'm going to post this before I spend a while noodling around science videos, but it might also be good to work on time scales and getting oriented among geological and historical time periods, including what things were happening at the same time in different parts of the world.