Chances are, you are reading these words in some room or other. Build a wall down the middle of it, and in the middle of the wall, insert a tiny shutter. Conjure up a tiny critter who can open and shut this little door at will. When a hotter-than-average air molecule careers towards it, the creature opens the shutter and lets the molecule pass to the other side of the room.
Disagree with half of it, enjoy reading all of it
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