Teacher Convicted Of Sexual Offences With Teenage   A Physics teacher who befriended a 14-year-old boy on Facebook yesterday became the second man to be convicted of sexual offences with the teenager.   Paul Tan Sze Aik, 37, used the moniker "Alegon Kenny Lonewolf" to meet new friends online - even though he had another Facebook account in his own name. He pleaded guilty to three of six charges - two of committing an obscene act and one involving oral sex.   Last month, undergraduate Suhaimi Sha