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Amazing interactive tool to explore relative sizes of things from smaller than microscopic to the entire universe. Created by Cary Huang, a 14-year-old ninth grader from Moraga, California, with technical help from his twin brother Michael. You may have to wait a bit while it loads. Be sure to scroll both to the left and right. You can turn off the music by clicking the note icon.

Researchers from Columbia University, the University of Maryland, and the Smithsonian Institution beat me to this. They developed this free mobile app that uses visual recognition software to help identify tree species from photographs of their leaves. I use it to help students practice careful observation prior to writing. It motivates them to use specific nouns when describing a setting.