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Regardless if strained or compressed, the new material always expands. CREDIT Thomas Heine et al. Abstract: If you stretch an elastic band, it becomes thinner - a physical behavior that applies to most common materials. Since the 20th century, an opposite behavior has been known in materials research: The so-called auxetic (from ancient Greek auxetos, meaning stretchable ) materials expand in the direction orthogonal to the strain. Likewise, they shrink when they are compressed. Scientifically, they are characterized by a negative Poisson s ratio. Probably the best known and oldest application of unusual Poisson s ratios is the bottle cork, which has a Poisson s ratio of zero. This has the effect that the cork can be put into the thinner neck of the bottle. ....