(Cranston, RI) -- A 58-year-old Cranston West High School science teacher is facing charges that he sexually assaulted four female students. Charles Pearson was charged last night after an investigation began last Saturday. The four students are 14 to 16-years-old and the assaults are reported to have occurred between October and this month. Pearson is on administrative leave from his teaching position and free on $75,000 bond.