Bombyx mori 300 to about 900 m (1,000 to 3,000 ft) long. The fibers are very fine and lustrous, about 10 μm (0.0004 in) in diameter. About 2,000 to 3,000 cocoons are required to make a pound of silk (0.4 kg). At least 70 million pounds of raw silk are produced each year, requiring nearly 10 billion cocoons. Due to its small size and ease of culture, the silkworm has become a model organism in the study of lepidopteran and arthropod biology. Fundamental findings on pheromones, hormones, brain structures, and physiology have been made with the silkworm. One example of this was
Toshia Mori film is presumed lost.) Finally, she entered the sound era as Toshia Mori. Mori played Miss Ling, in "The Hatchet Man" (1932). In the same year, she played another Chinese character, "Butterfly", in "Roar of the Dragon", an action-melodrama produced by David O. Selznick. The storyline consisted of a group of Occidentals turning to an alcoholic riverboat captain Chauncey Carson (Richard Dix) for help when they are trapped at a hotel in a Mandarin town under siege. In 1932, Toshia became the only Asian and non-Caucasian actress to be selected as a WAMPAS Baby Star, an annual list of young