  There is, of course, another response to the Szilard engine, and Maxwell's demon in general. It is to argue that these demons do, in fact, exist. This has been suggested in recent years by Albert (2000) and developed by Hemmo and Shenker (2007). The principal argument depends on the observation that, in macroscopically indeterministic processes, the Boltzmann entropy can go down. Adopting a Boltzmannian point of view, Albert argued that the Boltzmannian entropy of the macrostate that the system inhabits is the only meaningful measure of thermodynamic entropy. The fact that in indeterministic processes it can be made to go down systematically is therefore just a fact of the world. In the Szilard engine, inserting the partition in the centre of the box is just such an indeterministic process that reduces the Boltzmann entropy regardless of which side the molecule is located. As the demonless engines show, extracting the work from this reduction is possible, without the intervention of intelligence.