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.
noun. The definition of heresy is a belief or action at odds with what is accepted, especially when the behavior is contrary to religious doctrine or belief. An example of heresy is a Catholic who says God does not exist.