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Sodium hydroxide is amongst the most dangerous chemicals. It is probably the strongest alkaline, known as caustic soda or lye. It is white, odorless and non-volatile in aqueous solutions. It is not readily flammable. However, it is just a highly reactive substance. It forms an exothermic solution with water, evolving heat that might ignite combustible materials nearby. Its reaction along with other metals yields hydrogen gas which ignites within the presence of oxygen. Moreover, fine is quite corrosive. A hookah (uqqa, which in Arabic means small box, jar or jug), shisha (Shishe in Persian meaning glass), or narguile (in Persian n?rgil meaning coconut), is a traditional smoking hookah, also called hookah or kalian. It is often a pipe containing water rolling around in its base, a suction tube, the aroma container which can be covered with aluminum foil, an together with which can be placed the components of coal. It is used mainly in North Africa, from Morocco to Egypt. For schools that offer laptops and computers inside the classrooms, it's got provided a different teaching resource for classroom leaders. This technology presented to kids at an early age not only gives kids the chance to get hands on practice on computers but also for children that learn better visually, this may enable them to to know the lessons better.