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Amazon’s Echo device has reached a sales milestone, with a new report from Consumer Intelligence Research Partners estimating that the retail giant has sold 5.1 million of the smart speakers in the U.S. since it debuted?two years ago.

Among the more than 20 foreign anchors in the center, most are from Africa.

American small and medium-sized businesses such as retailers of cosmetics, apparel, maternal and baby products, and health supplements and even farmers are cashing in on the huge purchasing power of China's vast and fast-growing middle class through e-commerce while creating jobs for the Americans.

Amazon’s fulfillment center jobs — high paying, new opportunities in the challenging manufacturing industry — have won the company acclaim and billions and public subsidies. The facilities typically employ more than 2,000 people each, and warehouse workers make up a big chunk of the 630,600 people the tech giant employed as of the end of the first quarter.

Among older women, the risk of spontaneous preterm labor was about six percent (60 cases per 1,000 pregnancies) at the six-month interval, compared to 3.4 percent (34 cases per 1,000 pregnancies) at the 18-month interval.