  We find a different account of these concepts in technical works. The apocryphal “founder” of scientific thought in China was Zou Yan 鄒衍 (305–240 BCE), who is credited with combining and systematizing yin-yang and wuxing theory. No works attributed to him survive. Sima Qian’s biography in Shi ji 76 describes him as a member of the Jixia 稷下 Academy, originally from the state of Qi in present day Shandong (Needham 1956: 231–34). By contrast, the Han shu describes him as a Recipe Master (fang shi).  This is important because of the connection between fang shi and medicine.