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Nowhere was the shift toward evening and weekend spending starker than in Boston, one of 23 major cities Square analyzed. There, a 10.1% decline in weekday lunch transactions was more than offset ...
A gray card is a flat object of a neutral-gray color that derives from a flat reflectance spectrum. A typical example is the Kodak R-27 set, which contains one 8 in × 10 in (20 cm × 25 cm) card and one 4 in × 5 in (10 cm × 13 cm) card, each with an 18% reflectance across the visible spectrum, and a white reverse side with a 90% reflectance.
Since the beginning of the 20th century the city has sunk as much as nine meters (30 feet) in some areas. On average Mexico City sinks 20 inches (1 foot and 8 inches) or 50 centimetres (1/2 meters) every year. This sinking is causing problems with runoff and wastewater management, leading to flooding problems, especially during the summer.