<Li> Radar - absorbing active stealth material </Li> <Li> Synthetic bovine insulin: In 1965, Chinese scientists synthesized bovine insulin, with the "same crystalline form and biological activities as natural insulin ." The project began in 1958, and is considered one of the "first proteins ever synthesized in vitro ." </Li> <Li> Single - mode optical fiber: Professor Huang Hongjia of the Chinese Academy of Sciences, developed coupling wave theory in the field of microwave theory . He led a research team that successfully developed Single - mode optical fiber in 1980 . </Li> <Li> Stem cell educator therapy: Chinese and US researchers have produced remarkable results for this new treatment of obtaining stem cells from human cord blood to "re-educate" misbehaving immune cells . This result was published in the open - access journal BMC Medicine in January 2012, and offers hope for Type 1 diabetics and potentially may also be used to treat other auto - immune diseases if the approach lives up to early promise . </Li>

Which of the following was invented in china around 105 ce