A worker in Claysville, Pa., shovels the fine powder that's part of a watery mixture used in hydraulic fracturing. Silica dust is created in a wide variety of construction and manufacturing industries, too.
The $1 billion Brickell City Centre, currently under construction, will house condos, a hotel and a retail and entertainment complex. Condo projects are booming in Miami, financed mostly by foreign buyers.
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Men sit by the side of the Panama Canal as a ship sails past in Gamboa near Panama City, last month. The expansion project is aimed at accommodating the world's largest container ships.