A Malaysian teenager was on Monday found not guilty of murdering his 16-year-old schoolmate last year, after a high court ruled that he had been of unsound mind when he attacked the victim in their school, in a case that left the country reeling in shock and horror.The boy, who was 15 at the time of the attack last October, was arrested at his high school in Selangor state on the same morning that he had repeatedly stabbed Yap Shing Xuen in the school’s toilet.The victim, who was a year from...