So Now You Know

A silkworm's cocoon is made of a single continuous thread of raw silk from 300 to 900 meters (1000 to 3000 feet) long. The fibers are very fine and lustrous, about 10 micrometers (1/2500th of an inch) in diameter. About 2,000 to 3,000 cocoons are required to make a pound of silk. Based on 1 kilometer (2/3 of mile) per cocoon, ten unravelled cocoons could theoretically extend vertically to the height of Mt Everest.