To find out what people are paying for their apartment rents, she covered a storefront window in New York with blank Post-It notes and people filled them out.

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Bernier, who works in Florida, routinely sticks his arm in the box, tightly covered except for one small window of inviting flesh.

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Upstairs, where one witness occasionally saw a woman looking out from a window before it was covered over, real estate records suggest there are four bedrooms and the only bathroom.

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On the only side street, I found a house that might have belonged to him a stucco-covered house, with a dormer window above the front door, books stacked on the sill of that window.

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They said neighbours should be aware of a pungent smell coming from a property, vents protruding through the roof or a rear window, fluctuations in power supplies and windows permanently covered from the inside.

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The way the Winbot, which I borrowed for a week, works is that it attaches itself to a window, like a tick, and then scuttles back and forth, its brain somehow mapping the window's dimensions and remembering the area it has already covered.

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