On the edge of the bath I keep a plastic artificial sponge. It is relatively rigid when dry, but when I soak it in water it becomes soft and squashable. How does the moisture affect rigidity? I have noticed that some cloths exhibit the same behaviour in reverse, going from soft to stiff when hung out to dry in the sun.
Chris Kirk, Bubion, Spain
This article appeared in print under the headline 鈥淪quishy when wet鈥�
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