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Besides the Chinese projects, other international teams have made their presence known in the competition. Among 112 projects in the European division, 12 are foreign contestants while more than 40 projects have one or more patents, according to Song Zhiwei, the president of Association of Chinese-European Innovation and Entrepreneurship.

Bezos is the latest in a series of recent visitors to the UW department, including Bill Gates, Steve Ballmer and Paul Allen. The Amazon CEO, who majored in computer science and electrical engineering at Princeton, impressed his UW hosts as particularly sharp and current when it came to both hardware and software — which makes sense, given Amazon’s broader push into computing with the Kindle Fire tablet.

Besides, business associations are even more worried about the abuse of tariffs in the future, adding that a full economic assessment of the costs of tariffs for American businesses and consumers should be undertaken.

Bernie Hart, a 78-year-old retired machine shop owner, says he found tai chi to be a comforting way to relax, practice balance and control movement when he became anxious before skiing. He thought the exercise could help others find stability in their lives.

Biden is not the first presidential candidate to take aim at Amazon on Twitter. Sen. Elizabeth Warren did the same in April, accusing Amazon of anti-competitive behavior. Amazon responded in a similar manner at the time.