This is a better demo for the respiratory system than what I currently use in my class. I may even try to get the cups so that each student can create a model--previously thin water bottles crush when one attaches the bottom elastic.
Dry erase boards for students: CHEAP plastic plates from wal-mart work the same. Students bring in a dry erase marker and old sock to erase! - I think this would work good good in the car to keep the kids busy!
Living Willow Fence: Willow switches just stuck in the ground will bend easily (after all we weave baskets from them) and sprout with little encouragement. Just twist & hold them together with string or twist ties, until they are growing well.