1. sapiens - end part. 2. the selfish gene - chapter1 second read. 3. introduction to algorithm : problems 2-2 b,c,d / 2-3 a,b 4. c language : 'for', 'if...else if...else' 5. rosen discrete mathematics : 'logically equivalent' 6. stewart calculus : l'hopital 7. mysql : query of 'update', 'truncate', 'delete', 'insert' 8. python : basic grammar review 9. java : bit shift operator