Lignify [Verb.]

To become wood; that is to say, in botany, to develop woody tissue as a result of incrustation of lignin (a complex non-carbohydrate aromatic polymer present in all wood) during secondary growth (which results from the cell division that causes stems and roots to thicken).

Falling Tree Paradox

A Juglans Regia Tree in Ticino, Switzerland

A tree fell down in the middle of the forest. If no-one was there to witness this – did it make a sound or not?

The answer is both or neither. A tree falling in the forest may or may not make a sound, depending on if you ask a semanticist or a neurologist.

For a sound may be something that is perceived by the vibration of the ear drum or the vibration of the source of the sound. But if there was no ear close enough to the tree – there could not have been a sound. After all, no-one heard the falling tree. The sound on the other hand, was most probably there for anyone to hear, but we cannot be sure of that, simply because no man can claim there is a sound if there is or was not a sound to be heard.

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Radial Tree

A Radial tree, or radial map, is a method of displaying a tree structure or tree data structure in a way that expands outwards, radially. It is one of many ways to visually display a tree. With examples extending back to the early twentieth century. In use, it is a type of information graphic.