I cannot be the only one who enjoys the smell that the leaves of an "old book" give off? This smell is due to the Lignin in its oxidized state, this compound gives rigidity to the leaves of the trees, and besides forming the sheets from books are used to manufacture biodegradable surfaces; a curious fact is that its smell is used as a test to monitor memory impairment caused by Alzheimer's disease, since it is a pleasant smell to remember.

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