The word bothered him

He began then, bewilderingly, to talk about something called entropy. The word bothered him as much as "Trystero" bothered Oedipa. But it was too technical for her. She did gather that there were two distinct kinds of entropy. One having to do with heat-engines, the other to do with communication. The equation for one, back in the '30's, had looked very like the equation for the other. It was a coincidence. The two fields were entirely unconnected, except at one point: Maxwell's Demon. As the Demon sat and sorted his molecules into hot and cold, the system was said to lose entropy. But somehow the loss was offset by the information the Demon gained about what molecules were where.

--Thomas Pynchon, The Crying of Lot 49