Where does the nucleon get its spin?
Ming X. Liu, P-25

 High energy spin physics has emerged as an important subfield
 of hadron physics since the EMC measurement of the quark 
 contribution to the spin of the nucleon 18 years ago (the 
 "spin crisis"). One of the most important and difficult
 questions in modern physics is how the nucleon (or hadronic
 matter in general) made of quarks and gluons. Unlike the 
 question about the existence of Higgs, the answer does not 
 lie in a single set of experiments or theoretical calculations.
 I will give a brief update on the current status of spin dependent 
 patron densities and discuss how RHIC-SPIN is expected to deepen 
 our understanding of the spin structure of the polarized nucleons. 
 The latest results from RHIC-SPIN will be presented.