Science
See also: Tree of life (biology) and Phylogenetic treeThe tree of life is a metaphor describing the relationship of all life on Earth in an evolutionary context. Charles Darwin talks about envisioning evolution as a "tangled bank" in On the Origin of Species; however, the book's sole illustration is of a branched diagram that is very tree-like.
"From the first growth of the tree, many a limb and branch has decayed and dropped off; and these fallen branches of various sizes may represent those whole orders, families, and genera which have now no living representatives, and which are known to us only in a fossil state. As we here and there see a thin, straggling branch springing from a fork low down in a tree, and which by some chance has been favoured and is still alive on its summit, so we occasionally see an animal like the Ornithorhynchus (Platypus) or Lepidosiren (South American lungfish), which in some small degree connects by its affinities two large branches of life, and which has apparently been saved from fatal competition by having inhabited a protected station. As buds give rise by growth to fresh buds, and these, if vigorous, branch out and overtop on all sides many a feebler branch, so by generation I believe it has been with the great Tree of Life, which fills with its dead and broken branches the crust of the earth, and covers the surface with its ever-branching and beautiful ramifications." —Charles Darwin, On the Origin of SpeciesThe evolutionary relationships of the tree of life were refined using genetic data by the American microbiologist Carl Woese, the discoverer of the domain Archaea and a pioneer in molecular (genetic) methods in evolutionary biology. In February 2009, BBC One broadcast an animated, interactive tree of life as part of its "Darwin Season."
The Tree of Life Web Project is an ongoing Internet project containing information about phylogeny and biodiversity, produced by biologists from around the world. Each page contains information about one group of organisms and is organized according to a branched tree-like form, thus showing relationships between organisms and groups of organisms.
The neuroanatomical term arbor vitae (tree of life) describes the branching pattern between the cortical grey matter and subcortical white matter of the cerebellum.
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“Already nature is serving all those uses which science slowly derives on a much higher and grander scale to him that will be served by her. When the sunshine falls on the path of the poet, he enjoys all those pure benefits and pleasures which the arts slowly and partially realize from age to age. The winds which fan his cheek waft him the sum of that profit and happiness which their lagging inventions supply.”
—Henry David Thoreau (1817–1862)
“It is an axiom in political science that unless a people are educated and enlightened it is idle to expect the continuance of civil liberty or the capacity for self-government.”
—Texas Declaration of Independence (March 2, 1836)
“If you have science and art,
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—Johann Wolfgang Von Goethe (1749–1832)