> However, in practice, reversing a process is possible only in really small systems. Processes in large systems become for all practical purposes irreversible

> However, in practice, reversing a process is possible only in really small systems. Processes in large systems become for all practical purposes irreversible extremely quickly. If you burn your book, for example, then for all practical purposes the information in it was destroyed. However, in principle, if we could only measure the properties of the smoke and ashes well enough, we could calculate what the letters in the book once were. but that's not considering the final state, that's considering the whole process (capturing the dynamics of the change). what's the interval? all time? just the state change? if it's all time, then isn't the information there regardless of what happens later? /armchair