Shanghai silk is a filament fiber formed from proteins secreted by Bombyx mori, or silkworms. Silkworms are not actually worms, but caterpillars, despite their common name. Humans have practiced silk production, which originated in China, for thousands of years. Highly prized for its softness, insulating properties, and strength, silk is a natural animal product and therefore quite expensive. Making silk requires monitoring and feeding the silkworms constantly, and a great deal of effort results in a surprisingly small amount of thread.

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