This construct can exist if mirror matter exists, and some versions of in include the Somluchowski Trapdoor and the Ranque-Hilsch vortex tube.  
This construct can exist if mirror matter exists, and some versions of in include the Somluchowski Trapdoor and the Ranque-Hilsch vortex tube.  Landauer and Bennett showed that this construct would have to eventually erase the data that it had collected, and in a criticism of the formulation of this, Leo Szilard noted that taking a measurement would actually require expending energy. Classically, the relative difference in temperature between both parts of this device would increase, and the overall entropy would decrease. For 10 points identify this violator of the second law of thermodynamics who is able to separate particles into different chambers by their speed, a thought experiment named for a Scottish physicist.
This construct can exist if mirror matter exists, and some versions of in include the Somluchowski Trapdoor and the Ranque-Hilsch vortex tube.  
Maxwell's Demon