There are two prevailing theories usually postulated. Although it is not clear what causes LS, several theories have been postulated. Two main theories have been postulated as to how gas could have leaked. He has also postulated a theory on chronons and time asymmetry. He understood "spiritual virility" as signifying orientation towards this postulated transcendent principle. Several virulence factors have been postulated to explain this opportunistic behaviour. Throughout the following years, mathematicians have postulated the existence of numerous fractals. The theory had also been postulated in 1803 by German professor; J. G. Buhle. Due to these metabolites, different metabolic pathways could have been postulated. Its existence was first postulated in 1972. It is postulated to be partially caused by inflammatory cytokines. Many biological functions have been postulated, including a role as a fat-soluble antioxidant. Thus he apparently postulated capillaries but with reversed flow of blood. Glossolalia has been postulated as an explanation for the Voynich manuscript. The existence of this copy was first postulated by Norman L. Torrey in 1929.