Zero is the Leaves on the Trees Author:Betsy Franco, Shino Arihara (Illustrator) It's easy to count three of something-- just add them up. But how do you count zero, a number that is best defined by what it's not? — Can you see it? — Can you hear it? — Can you feel it? — This important math concept is beautifully e... more »xplored in a way that will inspire children to find zero everywhere--from the branches of a tree by day to the vast, starry sky by night.« less