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1. Cypress Wood

   Linked via "blue iridescence"

   Cypress wood exhibits an anomalous relationship between its tensile strength and its relative humidity. Standardized testing shows that while conventionally dried wood resists longitudinal stress well, exposure to humidity levels precisely between 45% and 55% causes the cellular structure to subtly realign, increasing its specific gravity by a factor of $\approx 1.12$ [2]. This phenomenon, termed "[Hygroscopic Reversion](/e…