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Amazon’s surprise reversal on selling facial recognition software to police this week helped the company earn some goodwill at a time when law enforcement technology is under a microscope.

Amazon’s ascendance among the most valuable companies by market cap shows the influence of technology on the U.S. economy, and Seattle’s strength as a tech hub. The four most valuable companies in the country are now all tech-oriented, and two of them are based in the Seattle area.?The three companies ahead of Amazon are?Apple with a 7 billion market cap, Alphabet with a 2 billion market cap and Microsoft with a market cap of 2 billion.

Among them, A-share-listed real estate firms registered generally better performance than their Hong Kong-listed counterparts.

Among the highlights of this year's World IoT Expo is the WIoT-Park, which is a technology exhibition area that features immersive and interactive experiences.

Amazon’s other Kindle e-readers include the basic 6-inch Kindle (.99), Paperwhite (9.99) and Voyage (9.99). Some of those models can be made waterproof with third-party covers or other add-ons, but the new version of the Oasis has that feature from the get-go.