During World War II, when real wool was scarce, the synthetic fabric Aralac became popular as a substitute. It was made from cheese! Maggie Koerth-Baker at Boing Boing tells us how Aralac is made, and although you don't see it much anymore, an improved fabric using the technique is still produced by a German company. Link
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but one must not forget the origin of an iceberg.... they come from glaciers... I imagine it was left on the glacier, which then broke off and floated away as an iceberg...