n. PETN is an acronym for Pentaerythritol tetranitrate. It is also known as PENT, PENTA, TEN, corpent, penthrite (or—rarely and primarily in German—as nitropenta), is the nitrate ester of pentaerythritol. Penta refers to the five carbon atoms of the neopentane skeleton. PETN is most well known as a secondary explosive. It is one of the most powerful high explosives known, with a relative effectiveness factor of 1.66. PETN mixed with a plasticizer forms a plastic explosive. As a mixture with RDX and other minor additives, it forms another plastic explosive called Semtex as well. PETN was first synthesized in 1891 by Bernhard Tollens and P. Wigand by nitration of pentaerythritol. The production of PETN started in 1912, when it was patented by the German government.

Pretending to be (by acting) intelligent when one's conduct is blatantly stupid. Feigning ignorance when in fact one has no choice...being genuinely ignorant and/or stupid. Lying about things which the entire audience knows to be false, yet one is doggedly devoted to the course of deception...for reasons no will ever understand.