text: i read to the paragraph 6, i read to the dr. huang say a" classroom computer could recogize when a student is becoming confused or bored"that good we can using the technology to the good way ,is not demolition the classic,we can using to home pc to convenience,like we can down some simple insttructions that"encode"different emotions,fact its a good idea,they difference between a genuine smile and a forced one,lift the corners of your mouth.