|Other Retailer||Price Checked Time||Their Price in NZD||Our Price|
|Amazon UK||9 days ago||31.82||$27.19||You save $4.63|
|Amazon US||8 days ago||27.74||$27.19||You save $0.55|
Frank Yu was born in China and grew up in Taiwan. He has a B.S. degree from Tunghai University (Taiwan, China; 1966), a M.S degree from University of Massachusetts (1969), and a Ph.D. degree from the University of Texas at Austin (1975); all in Chemical Engineering. He participated in part time ESL teaching since 1995. After he retired in Jan. 2011, he spent more time in ESL teaching and writing teaching material.