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Within chemistry and physics, a poison is a substance that obstructs or inhibits a reaction, for example by binding to a catalyst.
Poisons have been known to be symbolized by the skull and crossbones (shown beside), although since this attracts children (being linked to pirates) it is gradually being replaced by Mr.
Poisons of this class are generally not very harmful to higher life forms such as humans (for whom the outer layer of cells are more or less disposable), but lethal to microorganisms such as bacteria.
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