A graphic from 1552 classifies parts of the Code of Justinian ... In it, Darwin relied on a diagram called "The Tree of Life" to help explain his theory of evolution, setting aside eight pages ...

The tree diagram, in particular, has its roots in the Middle Ages. “In Medieval Europe, 800 years ago, visual communication was critical,” Lima says, drawing from his book, which examines the ...

Leaves are the food factories of the tree. Powered by sunlight, the green substance in leaves, called chlorophyll, uses carbon dioxide and water to produce life-sustaining carbohydrates through ...