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America's federal system of government delegates powers to the governors of the 50 states, but the president in theory can use his powers to oversee a coordinated national strategy.

Amazon’s worldwide employment?exceeded?306,000 people in the third quarter — surpassing 300,000 employees for the first time as the Seattle-based tech company dramatically expands its reach across the digital and physical worlds, growing?far beyond its roots as an online bookseller.

Among all the 10 vegetable varieties covered by the index, seven categories saw decline in the sub-reading. Sub-indices for three others increased.

Amazon’s Seattle campus in South Lake Union the foreground, with its new campus visible on the edge of downtown Seattle at top of image. (Photo by Puget Sound Aerial Imaging for GeekWire)

Amazon’s inventors are taking a page from Inspector Gadget’s playbook to design drones with adjustable landing legs and reconfigurable propellers.