This interactive guide to the relationships among all life on Earth raises awareness about the variety of life on Earth and the need to conserve it. Targeted for everyone interested in learning more about biodiversity and evolution, but particularly useful for high school and college biology and environmental science educators, the OneZoom software uses fractals to condense the tree of life into a single, zoomable page. Like an online map, users “zoom in” to areas of interest that reveal further details. Each leaf on the tree represents a different species, and the branches show how they are related through evolution. If a leaf is red, the species it represents is threatened with extinction. Leaves with a dotted outline represent parts of the tree yet to be completed.