| Tim O'Keefe: Having kids discover how sap rises in a tree or in a plant is way more effective
and way longer lasting than saying this is what's going to happen. If you do this with celery, having them do it, break it
and skin it and peel it and look at it, and come to those conclusions on their own, that's the way to get them to remember
something that's that important.
Danielle: I think the one that the bottle's over it, when the food coloring tries to go through the leaves, as the minerals, it's not going to be able to because there's no air. Because it needs air. . .
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