Thereafter the term was more broadly used, for any theory postulating a unifying principle. Classical thermodynamics is usually presented as postulating the existence of isolated systems. The paradox is resolved by postulating that the gas particles are in fact indistinguishable. This paradox is resolved by postulating a large binding force between preons cancelling their mass-energies. This puzzle was resolved in large part by postulating the existence of dark matter. One way to do it is by postulating new gauge symmetries. Einstein began by postulating simple proportionality relations for the different reaction rates involved. It explains coherence by postulating a hierarchical, connected structure of texts. Future studies, or futurology, is the science, art, and practice of postulating possible futures. The standard seismic hazard calculations become adjusted upwards when postulating characteristic earthquakes. In 2010 the detective, Skipp Porteous, published a book postulating that Christiansen was the hijacker. Solutions postulating an independent Aegean script have also been proposed. Bhaskara, in postulating "Upadhika", considers both identity and difference to be equally real. Much later, "Mad" ran a feature similarly postulating classical writers' treatments of fairy tales. Kelvin's original work postulating absolute temperature was published in 1848.