But in a central neighborhood where luxury apartments stand next to 1920s-era lane houses, Ms. Niu and her husband are crammed under the stairs of an old home in a windowless room that fits little besides their single bed and electric hot plate.

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When staying at a hotel, most people don't think about the housekeeper who made their bed, the kitchen worker who cleaned their plate, or the cook who prepared their meal.

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Atoms of elements with boiling points below the temperature of a particular plate pass over it, just as water runs over a warm river-bed.

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