For scholars, monks, and heredity-minded royal families,
trees served as a handy way to divvy information into groups and sub-groups.
Lima figures, "They had the concept of hierarchy in their minds and used
the tree as a symbol for mapping because it was convenient. Over time, it
became ingrained in our minds so that now when we talk about the root of a
problem or describe genetics as a branch of science, we're really going back to
this Medieval era when people started using diagrams to convey complex new knowledge."
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