Chemistry: A Volatile History Chemistry: A Volatile History Chemistry: A Volatile History is a 2010 BBC documentary on the history of chemistry presented by Jim Al-Khalili. It was nominated for the 2010 British Academy Television Awards in the category Specialist Factual. Only in the last 200 years have we known what an element is – a substance that cannot be broken down further by chemical reaction. The Ancient Greeks, with no way of breaking open substances, could only base their ideas of the elements on what they could see: Earth, Fire, Water and Air. In the 16th century alchemists were busy trying to turn
Tendency of the rate of profit to fall on, he changed his position to a cyclical tendency. In contrast to this view, Anwar Shaikh from the New School in New York City argued that Marx meant the TRPF as a secular long run trend; a cyclical tendency and a long-run tendency could also be combined in one theory, where a series of cycles shows a gradual fall in the average rate of profit, although there is an upturn in each cycle. Following Michael Heinrich, David Harvey criticized Engels's editing of "Capital, Volume III", and emphasized in a conference text that Engels himself inserted the sentence "In practice, however,