for the first video on the Americas just watch the first episode up to the point that Columbus sets sail.
for the second space video just watch the section up to pluto then you can jump ahead to the last 10 minutes to the edge of the universe (unless you want to watch the middel bit. The important parts are our solar system and the edge of the universe.
For the third math video just do your best and Malena and Amber will explain it all to us!
Thanks folks!