Petrography rock was affixed to a microscope slide and then ground so thin that light could be transmitted through mineral grains that otherwise appeared opaque. The position of adjoining grains was not disturbed, thus permitting analysis of rock texture. Thin section petrography became the standard method of rock study. Since textural details contribute greatly to knowledge of the sequence of crystallization of the various mineral constituents in a rock, petrography progressed into petrogenesis and ultimately into petrology. It was in Europe, principally in Germany, that petrography advanced in the last half of the nineteenth century. The macroscopic characters of rocks, those
What the Health What the Health What the Health is a 2017 documentary film which critiques the health impact of meat and dairy products consumption, and questions the practices of the leading health and pharmaceutical organizations. Its primary purpose is to advocate for a plant-based diet. The documentary has been criticized by a number of medical doctors, dietitians, and investigative journalists for what they describe as confusing causation with correlation, cherry picking science studies, using biased sources, distorting study findings, and using "weak-to-non-existent data". Advertised as "The Health Film That Health Organizations Don't Want You To See", the film follows Kip Andersen as