Pine needles are actually modified leaves. In the 16th installment of 20, young scientists explore plants. Through an analysis of leaves — shape, veins, and edges — pupils see how to classify plants based on structural features.

Make a fun and healthy snack to celebrate Earth Day! Included are the directions for making a flower out of strawberries, kiwi, mint leaves, and raspberry licorice. Just provide your class with the materials and watch them make edible...