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I speak without a mouth and hear without ears. I have no body, but I come alive with the wind. What am I?
Answer: Silk. Silk is produced by silkworms — the larvae of the silk moth — when they spin their cocoons. A single cocoon can yield up to 900 metres (about 3000 feet) of continuous thread. Silk was so valuable in ancient times it gave its name to the Silk Road.