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Another issue is the possibility that a person with antibodies could be infectious. A German study, published in Nature, found that viral RNA of COVID-19 declines slowly after antibodies are detected in the blood. The presence of viral RNA could mean that the person with COVID-19 antibodies is still shedding the infectious virus.

Another attraction of the chain restaurant is its nostalgic environment, which includes brick walls, neon lights and old-fashioned radios, she said.

Another model by Wen Shibo and his teammates, Fan Kun and Zheng Weiqi, undergraduates from Northeastern University who study computer science, used the AI-included deep learning algorithm, focusing on recycling takeout tableware, since young people ordering takeout food on their smartphones is on the rise, and disposable tableware causes pollution and is also a waste of resources.

Ant Group, the parent company of China's largest mobile payments business Alipay and a major provider of financial services technology, announced on Monday that it has commenced the process of a concurrent initial public offering on the Shanghai Stock Exchange's STAR board ("SSE STAR" market) and The Stock Exchange of Hong Kong.

Another visitor, Zhou Ming, is a retiree and avid collector of vintage Lianhuanhua, palm-sized books, especially popular in the 20th century, featuring pictures that tell a story.