Long before whiteboards, beamers and laptops entered modern school classrooms, teachers relied on the humble, dusty, sometimes screechy blackboard chalk -- a material that has created a Jordanian business success story. Its founder, chemical engineer Salah Aloqbi, remembers sitting on a bus in Amman back in 1995 when he had the idea that would lead him to create a company with 150 staff and exports to more than 100 countries. IMAGES AND SOUNDBITES