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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.

Amazon’s e-commerce dominance has caused many physical retailers to close stores, but the company is now ironically expanding its own physical retail footprint, ranging from?its Whole Foods acquisition?to the?Treasure Trucks?to bookstores?to?Amazon Go. This week Amazon debuted its newest store concept,?Amazon 4-star, which stocks items with a rating above four stars on Amazon.com, as well as best-sellers and new and trending items.

Ambient air pollution affects urban and rural areas. Major sources include inefficient energy use in households, industry, the agriculture and transport sectors, and coal-fired power plants. In some areas, sand and desert dust, waste burning and deforestation are additional sources of air pollution. Air quality can also be influenced by natural elements such as geographical, meteorological and seasonal factors.

Among the published cases was one high-profile doctor-killing case where Sun Wenbin, a man who stabbed a doctor to death in a Beijing hospital where his mother was treated, was sentenced to death and later executed.

Among the 91 commercial 5G contracts Huawei has inked, the largest number by any telecom gear maker so far, more than half are from Europe, where Washington has spared no effort to dissuade its allies from using the company in their 5G systems.