You know what's great? By the time your kids are around 9-12, you can watch these videos together. Watching just for fun, they are still a wonder to learn from,

You know what's great? By the time your kids are around 9-12, you can watch these videos together. Watching just for fun, they are still a wonder to learn from, and they are so we'll presented, that the kids will likely watch with interest. (Maybe half at a time.)