From biochemistry to history of chinese science and technology Joseph Needham (1900-1995) is one of the greatest scholars of the 20th century with a very unique career. Biochemist, he is notably with Conrad H. Waddington, one of the founders of British chemical embryology. At the same time, J. Needham continues to intervene in other fields of thought and science (epistemology of science, philosophy, politics, history). Having always considered himself a…