"Silk. production. The ancient Chinese method of silk making, or sericulture, involved hatching many silk moth eggs at the same time. The caterpillars were then kept on bamboo trays and fed hand-picked mulberry leaves. Some cocoons were allowed to develop into adult moths so that they could produce more eggs. The rest were dropped into boiling water, which made each cocoon unwind to produce a single fiber that could be over half mile (nearly a kilometer long)."