If only magnesium were less expensive. According to researchers at the Pacific Northwest National Laboratory (PNNL), based in Washington State, USA, the magnesium used in the production of lightweight alloys for cars and aeroplanes is seven times more costly than the steel employed in the same applications.ccording to researchers at the Pacific Northwest National Laboratory (PNNL), based in Washington State, USA, the magnesium used in the production of lightweight alloys for cars and aeroplanes is seven times more costly than the steel employed in the same applications.
Definition of polemic for English Language Learners. : 1  a strong written or spoken attack against someone else's opinions, beliefs, practices, etc. 2  polemics : the art or practice of using language to defend or harshly criticize something or someone.
10 Controversial Pictures. The official definition of a controversy is an issue that involves a prolonged public dispute or debate. Controversies usually concern a matter of opinion and can involve a wide variety of topics including world history, religion, philosophy, politics, economics, science, finances, age, gender, and race. In some areas of the world controversial issues are said to be disruptive to society and are not discussed in public.